From the calculation, the percentage of water in the sodium hydroxide sample is 7%.
What is neutralization?The term neutralization has to do with the reaction between an acid and a base to yiled salt and water.
Now we have to apply the titration formula;
CAVA/CBVB = NA/NB
CA = concentration of acid
CB = concentration of base
VA = volume of acid
VB = volume of base
NA = number of moles of acid
NB = number of moles of base
The reaction equation is; HCl + NaOH ----->NaCl + H2O
CAVANB = CBVBNA
CB = CAVANB /VBNA
CB = 34.9 * 0.2 M * 1/10 * 1
CB = 0.698 M
Number of moles = Conncentration * volume
= 0.698 M * 100/1000 L = 0.0698 moles
Mass = Number of moles * molar mass
Mass = 0.0698 moles * 40 g/mol = 2.79 g
percent of NaOH = 2.79 g/ 3g * 100/1 = 93%
Percent of water = 100- 93 = 7%
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How many Hydrogen atoms are in 4HN₃?
Which of the "planetary health measures" shown here have humans already exceeded?
Question 1 options:
global average surface temperature
ocean pH
atmospheric Carbon Dioxide
sea level rise
Answer:
the answer is atmospheric carbon dioxide
Explanation:
The presence of carbon dioxide in atmosphere warms the planet and causes the climate change. Human activities have raised the atmospheric CO₂ content. Here atmospheric carbon dioxide is the planetary health measures which humans already exceeded. The correct option is C.
What is planetary health measures?The planetary health measures offers a way to understand the relationship between human health and the environmental sustainability. The global environmental degradation and climate change threaten the foundation of human health and well being.
Carbon dioxide is an important greenhouse gas that comes from the burning of fossil fuels like coal or oil which traps heat. The increased level of CO₂ in the atmosphere causes greenhouse effect and it does not allow hot rays of the sun to escape from the atmosphere.
The increased level of CO₂ also causes the global warming which increases the temperature of the earth.
Thus the correct option is C.
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Please help..
1. How much water could you get if you started with 250.0 grams of hydrogen?
2. How much water could you get if you started with 250.0 grams of oxygen?
3. How much propane would you need to produce 1000.0 grams of water?
4. How much of each reactant is needed to produce 150 grams of hydrogen gas?
Molar mass of 2H2, O2 and 2H2O is 4g, 32g and 36 g per moles respectively.
That is , 4g of H2 = 36g of water
250g of H2 = xg of water
Make xg the subject of formula,
xg = 250× 36/4
xg = 9000/4
xg = 2250g of water
From the balanced equation for water formation: 2H2 + O2 ---> 2H2OMolar mass of 2H2, O2 and 2H2O is 4g, 32g and 36 g per moles respectively.
32g of oxygen = 36g of water
250g of oxygen = xg of water
Make xg the subject of formula,
xg = 250 × 36/32
xg = 9000/32
xg = 281.25g of water
The balanced chemical equation for the combustion of propane is:C3H8(g)+5O2(g)→3CO2(g)+4H2O(g).
Molar mass of propane and water is 44g and 72g per mole.
if 44g of propane = 72 g of water
xg of propane = 1000g of water
make xg the subject of formula,
xg = 44 × 1000/72
xg = 44000/72
xg = 611g of propane
The electrolysis of water can be used to the form hydrogen gas. The balanced equation is listed below:2 H2O → 2H2 + O2
Molar mass of 2H2O and 2H2 is 36g and 4g respectively.
If 36g of water = 4g of Hydrogen
xg of water = 150 g of hydrogen
Make xg the subject of formula,
xg = 36×150/4
xg = 5400/4
xg = 1350g of water
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Prepare 100. ml of 0.1 N H2SO4 by diluting from original H2SO4.
Eq. wt. of H,SO4 = 98/2=49 .
d H2SO4= 1.08
Purity =98%
Density for 98% = 1.84 g/mL
V M = # mol
0.1 L x 1 M = 0.1 mol
0.1 mol x 98 g/mol = 9.8 g
m =%CDV
9.8 g = 0.98 x 1.84V
V = 5.43 mL
take this volume and carefully (acid to ater) dilute till 100 mL
What kinda worm is sometimes used to prevent blood clots
Answer:
Leeches
Explanation:
leeches secrete peptides and proteins that work to prevent blood clots
Answer:
Leeches
Explanation:
They aren't as commonly used as they may have been in places such as ancient Rome or Egypt. But leeches are still used today, even in procedures such as microsurgery. Leeches secrete polypeptides and enzymes that work to prevent blood clots. So they can be useful when it's crucially necessary to avoid bloodclots during a procedure.
Explain why the ionic radii for S^-2 is larger than O^-2?
Answer:
When comparing two ions, gaining the same electrons, atomic radii, you can follow the same general rule as regular ionic radius.
Explanation:
In general, Sulfur has a larger atomic radius than Oxygen, as it is lower on the periodic table. Since they both are gaining the same amount of electrons, the trend still applies
Which of the following most accurately describes diffusion?
Answer:
Diffusion is the movement of a substance from an area of high concentration to an area of lower concentration
hope this helps!!!
Is it true you can make Napalm with diesel and styrofoam?
Answer:
Yes. Diesel works the best.
Explanation:
Homemade Napalm can be made using the following procedures; Using an enormous container, fill it about halfway with gasoline. Which means Diesel works the best. Break the special soap, Styrofoam(polystyrene), plate into small pieces.
Bonding with intermolecular forces:
1.) is CH3Br a hydrogen bonding? yes or no?
2.) is CH3Br dipole-dipole interactions? Yes or no?
3.) is CH3Br a london dispersion forces? Yes or no?
Answer:
1. yes
2. yes
3. no
sorry if wrong but hope this helps
Metal: Specific Heat (J/goC)
Calcium: 0.647
Iron: 0.449
Silver: 0.235
Gold: 0.129
After absorbing 0.500 kJ of energy, a 55.5 g sample of an unknown substance has a temperature increase of about 14 degrees Celsius. Identify the substance.
Group of answer choices:
A.) Gold
B.) Iron
C.) Silver
D.) The substance is not listed.
E.) Calcium
Identified substance which is present in the sample of 55.5g is calcium, because the calculated and actual specific heat is almost same.
What is the relation between specific heat and absorbed heat?Relation between the amount of absorbed heat and specific heat of any substance is shown by following equation:
Q = mcΔT, where
Q = absorbed heat = 0.500kJ = 500Jm = mass of unknown substance = 55.5 gc = specific heatΔT = change in temperature = 14 degrees CelsiusOn putting all these values on the above equation, we get
c = 500 / (55.5)(14) = 0.643 J/g. degrees Celsius
And this value is almost equal to the given specific heat value of calcium, so the given substance is calcium.
Hence the given unknown substance is calcium.
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CH3NH2 + H2O = (CH3NH3)1+ + (OH)1-
Which are the acids and which are the bases.
Answer:
CH3NH2 + H2O = CH3NH3 + OH - Balanced Chemical Equation
Explanation:
CH3NH2- BASE
H20- both
CH3NH3- ACID
OH- BASE
would you prefer to live your dream forever or sacrifice you living your dream to let everyone else live their dream forever (brainliest)
I would perfer to prefer to live my dream forever because I wouldn't let someone be stuck with my dream forever because I would rather tourture my self other than to toutour everybody else.
I would rather let everyone else live their dream, because living a dream forever after a certain point would get boring, no matter how fun it seems. Additionally, just because I sacrifice me having my dream doesn't mean I wouldn't be able to enjoy life. It just means that I wouldn't be able to live out my best scenario.
HELPPPPPPP A certain reaction is endothermic in the forward direction. The reaction has less moles of gas on the product side. Which of the following stresses would increase the yield of the products (shift right)? (5 points)
Group of answer choices
Increasing the pressure
Decreasing the temperature
Increasing the volume
Decreasing the reactant concentration
Answer: Option A
Explanation:
Increase in temperature will increase the yield of the product and cause a shift to the right.
What is an Endothermic reaction?
This is the type of reaction in which reactants absorb heat energy from the surroundings to form products.
This depicts that an increase in temperature will increase the yield of products thereby making option A the most appropriate choice.
Arrange these elements according to atomic radius.
Largest radius
Smallest radius
Answer Bank
K
Ca
Mg
Be
Rb
Answer:
straight to the point:
Explanation:
atomic radius of :
k = 280 pm
Ca = 231 pm
Mg = 173 pm
Be = 153 pm
Rb = 248 pm
pm means "picometers".
so knowing this we will have :(largest to smallest),
k
Rb
Ca
Mg and
Be.
hope this helps .
Which of these is NOT true about sandy soil?
A) It's gritty to the touch.
B) It crumbles, even when wet.
C) It's made of large particles.
D) It supports many kinds of plants.
Which of these data points is the most reliable?
Answer:
third point
Explanation:
omniscient because it gives info about every character instead of one
hope this helps
carbon reacts with oxygen to produce carbon dioxide (CO2(g),deltaHf=-393.5kl/mol)according to the equation below
The heat required to form 1 mole of carbon dioxide from carbon and oxygen is 393.5 kJ/mol.
What is the enthalpy of formation?Enthalpy of formation of a substance is the heat required to form 1 mole of a substance from its reactants.
Carbon reacts with oxygen to produce carbon dioxide.
The enthalpy of formation of carbon dioxide is -393.5 kJ/mol.
Therefore, the heat required to form 1 mole of carbon dioxide from carbon and oxygen is 393.5 kJ/mol.
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A chemist reacted 17.25 grams of sodium metal with an excess amount of chlorine gas. The chemical reaction that occurred is shown.
Na + Cl2 → NaCl
If the percentage yield of the reaction is 88%, what is the actual yield? Show your work, including the use of stoichiometric calculations and conversion factors.
Answer:
The actual yield is 38.59g of NaCl
Explanation:
Balanced equation: 2Na+CI2-->2NaCl
actual yield= (percent yield*theoretical yield)/100
Theoretical yield=
17.25*(1/22.989769)*(2/2)*(58.442769)=43.8515
43.8515*0.88=38.59 grams of NaCl
The actual yield is 38.59g of NaCl
The theoretical yield of the reaction is obtained as 43.87 g. The percentage yield is given 88%. Then, the actual yield is 38.6 g.
What is percentage yield?The percentage yield in a reaction is the ratio of actual yield to the theoretical yield multiplied by 100. The balanced chemical equation equation of the reaction is :
[tex]\rm 2Na + Cl _{2} \rightarrow 2NaCl[/tex]
Atomic mass of Na = 23 g
2 Na = 46 g
molar mass of NaCl = 58.5 g
2 NaCl = 117 g.
46 g of sodium metal gives 117 g of NaCl. Hence, the mass of NaCl produced from 17.25 g of Na is :
(17.25 × 117) /46 = 43.87 g
Thus the theoretical yield of the reaction is 43.87 g.
The percentage yield = 88%
Hence, actual yield / theoretical yield = 0.88
Actual yield = 0.88 × 43. 87 = 38.6 g.
Therefore, the actual yield of the reaction is 38.6 g.
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state three chemical properties of hydrochloric acid
Explanation:
Hcl is the one of the strongest acids as it disassociates almost everything. Its Chemical formula is HClIt has a unique pungent smell. it is commonly used in laboratories used for both in its aqueous and gaseous formHope it helps...
Answer:
H2o,hydrogen,carbonoxide
Which is an example of an instinct?
Answer:
An innate, typically fixed pattern of behavior in animals in response to certain stimuli.
Sugar is easily soluble in water and has a molar mass of 342.30 g/mol. What is the molar concentration of a 246.8 mL aqueous solution prepared with 72.1 g of sugar?
Answer:
.853 M
Explanation:
(72.1 g / 342.3 g/mole) / (246.8 ml /1000 ml/l )= .853 M
5. Most frogs live both in water and on land, leading to a variety of characteristics. How does a frog us
its lungs to survive in one of these environments? (SC.5.L. 17.1)
A. They allow the frog to breathe underwater.
B. They allow the frog to breathe on land.
C. They allow the frog to maintain a constant body temperature.
. They allow the frog to use less energy when jumping long distances.
how many o2 molecules are present in 0.470 of oxygen gas
Answer:
The number of molecules in 16 grams of oxygen gas is 3.01*10^23, equal to half of Avogadro's number
Explanation:
If the magnetic energy stored by a 0.50 H inductor is 3.6 J, what is the current through it?
A. 0.13 A
B. 0.90 A
C. 1.8 A
D. 3.8 A
E. 5.4 A
The current passing through the inductor is 3.8 A. The correct option is D. 3.8 A
Energy stored in a magnetic fieldFrom the question, we are to determine the current passing through the inductor.
From the formula, for the energy stored in a magnetic field
E = 1/2LI²
Where E is the energy
L is the inductance
and I is the current
From the given information,
E = 3.6 J
L = 0.50 H
Putting the parameters into the formula, we get
3.6 = 1/2 × 0.50 × I²
3.6 = 0.25 × I²
I² = 3.6 ÷ 0.25
I² = 14.4
I = √14.4
I = 3.7947
I ≅ 3.8 A
Hence, the current passing through the inductor is 3.8 A. The correct option is D. 3.8 A
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What volume of 1/5 M and 1/8 M HCl solution must be mixed to obtain 3 L of 1/7 M HCl?
0.72 L and 2.28 L of 1/5 M and 1/8 M HCl solution are required respectively to obtain 3 L of 1/7 M HCl.
What is the concentration of a solution?The concentration of a solution is the amount of substance a given volume of the solution of that substance.
The final concentration and volume of the mixture is 3 L of 1/7 M HCl.
Let the volume of 1/5 M and 1/8 M HCl solution required be X and Y respectively.
X + Y = 3 L
Liters of y = 3 -
[.0.2 X + 0.125 * (3-X)] / 3 = 1/7
(0.2X + 0.375 - 0.125X) / 3 = 1/7
(0.075 X / 3) = 1/7 - 0.375/3
(0.075X / 3) = 0.018
Multiplying both sides by 3
0.075 X = 0.054
X = 0.72 L
Y = 2.28 L
Therefore, 0.72 L and 2.28 L of 1/5 M and 1/8 M HCl solution are required respectively.
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How much potassium chloride will dissolve in 25 grams of water at 80°C?
Please I need help
Answer:
The problem provides you with the solubility of potassium chloride,
KCl
, in water at
20
∘
C
, which is said to be equal to
34 g / 100 g H
2
O
.
This means that at
20
∘
C
, a saturated solution of potassium chloride will contain
34 g
of dissolved salt for every
100 g
of water.
As you know, a saturated solution is a solution that holds the maximum amount of dissolved salt. Adding more solid to a saturated solution will cause the solid to remain undissolved.
In your case, you can create a saturated solution of potassium chloride by dissolving
34 g
of salt in
100 g
of water at
20
∘
C
.
Now, your goal here is to figure out how much potassium chloride can be dissolved in
300 g
of water at this temperature. To do that, use the given solubility as a conversion factor to take you from grams of salt to grams of water
Can anyone help me? :)
Worth 30 points to first right answer!
Which of the following is NOT a skill scientists use to learn about the world? a. Predicting c. Inferring b. Observing d. Scientists use all of the above skills Please select the best answer from the choices provided A B C D
Drag each label to the correct location on the chart.
Classify the natural resources as renewable or nonrenewable.
Water, Natural Gas, Sunlight, Wind, Wood, Coal, Oil, Uranium, Metal ores
Natural resources are the resources that are generated and found in nature. Water, wood, sunlight, and wind are renewable sources of energy.
What is renewable and non-renewable energy?Renewable sources of energy are the resources that replenish after depletion over time and are not limited in amount. They get reloaded through the natural process over finite time.
Wind or the air, sunlight from the sun, water, and wood from trees are some examples of renewable sources of energy.
Non-renewable sources of energy are the resources that cannot be easily replenished by natural means after overconsumption as the process of the formation takes hundreds of billions of years.
Oil, natural gases, coal, uranium, and metal ores are nonrenewable sources of energy.
Therefore, natural resources can be renewable or non-renewable.
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What type of system is associated with weather that has lots of clouds and thunderstorms with the possibility of tornadoes?
A.
low pressure system
B.
arctic system
C.
circulatory system
D.
high pressure system
Answer:
A. Low pressure system
Explanation:
A low pressure system allows for more cloud development. I think of it as in, since the clouds have low pressure on them they can do whatever they want but if the clouds have a high pressure on them, they tend to not do much and most of the time not even form.
I hope this helps, good luck :)