Answer:
b. 3.66x10²³ atoms of chromium.
Explanation:
First we calculate how many moles are there in 31 grams of chromium, using its molar mass:
Molar Mass of Chromium = 51 g/mol (This can be found on any periodic table)31 g ÷ 51 g/mol = 0.608 molThen we calculate how many atoms are there in 0.608 moles, using Avogadro's number:
0.608 mol * 6.023x10²³ atoms/mol = 3.66x10²³ atomsThe correct answer is thus option b. 3.66x10²³ atoms of chromium.
How many grams of NaOH are contained in 5.0*10ml of a0. 77 sodium hydroxide solution
Answer:
1.54grams
Explanation:
Molarity of a solution = n/V
Where;
n = number of moles (mol)
V = volume (L)
Based on the information given in this question;
Volume of NaOH solution = 5.0 × 10ml
= 50ml = 50/1000 = 0.050 L
Molarity = 0. 77 M
Using; Molarity = n/V
0.77 = n/0.05
n = 0.77 × 0.05
n = 0.0385mol
To find the mass (grams) of NaOH in the solution, we use the following formula:
mole (n) = mass/molar mass
Molar mass of NaOH = 23 + 1 + 16 = 40g/mol
0.0385 = mass/40
mass = 0.0385 × 40
mass = 1.54grams.
250 mL of water is collected during a combustion reaction. The temperature in the
room is 23 °C and the pressure is 105 kPa. How many moles of water was collected?
(please show work)
Answer:
10.67 moles is the answers.hope it helped
All rivers have deltas; explain the process that forms these common landmasses.
How does a river form a delta?
Deltas are wetlands that form as rivers empty their water and sediment into another body of water. ... Deltas are wetlands that form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river. Although very uncommon, deltas can also empty into land.
How is beryllium (Be) similar to calcium (Ca)?
Explanation:
beryllium, calcium, strontium, barium, and radium; they are in the same group of table.
Answer:
Both Beryllium and Calcium have 2 valence electrons, i.e. in ther electronic configuration there are 2 electrons remaining in the outermost shell. Thus their valencies are also 2.
Electronic Configurations:
Beryllium (4) : - [2, 2]
Calcium (20) : [2, 8, 8, 2]
Hope it helps
Thank you for the question
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Edit
a. both are very reactive
b. both react readily with elements in group 1
c. both rarely combine with other elements
d. both are rare metals
(As per the suggestion of bvbfanforeverap5j54d)
What would be the pressure if a canister with a volume of 8.95 L holds 0.155 mol of N2 at 23C
The pressure of a container with a volume of 8.95 L holds 0.155 mol of N₂ at 23°C is 42.64 atm.
What is ideal gas law ?Ideal gas law is also called as perfect gas law. It is represent by the equation PV = nRT, where, 'P' is the pressure, 'V' is the volume in liters, 'n' is the number of particles in moles, 'T' is the temperature in Kelvin and 'R' is the ideal gas constant.
By ideal gas equation,
PV = nRT
Where,
P = Pressure
V = Volume
n = Number of moles
R = gas constant
T = Temperature
First convert temperature into kelvin
23°C + 273 = 296.15K
By putting given value in ideal gas equation we can solve this problem
P × 8.95 = 0.155 × 8.314 × 296.15 ÷ 8.95
= 381.64 ÷ 8.95
= 42.64 atm
Thus, The pressure of a container with a volume of 8.95 L holds 0.155 mol of N₂ at 23°C is 42.64 atm.
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A 1500 L weather balloon is at a temperature of 290 K on the ground. As it rises the
temperature drops. At 15,000 ft, the temperature is down to 210 K. What is the
volume at this elevation? (please show work)
Answer:
1500/290 = x/210 = 1086.2 L
Explanation:
This problem is solved with Charles Law which says
V¹/T¹ = V²/T²
Which of the following microorganisms is most likely to get its main source of nutrition from a host?
Bacteria
Parasite
T-cell
Virus
Answer:
A Parasite.
Explanation:
Viruses and bacteria can survive in most areas without a host. Parasites however need a host to survive. Some parasites include: tapeworm, roundworms, flukes, and protozoa.
if you were to toss a lit match onto a planet of hydrogen AND oxygen, would the planet explode?
Answer:
yeah the planet would go boom
A human nose is capable of detecting how many basic odors?
a.
20
b.
40
c.
49
d.
50
Answer:
20
Explanation:
Determine the number of atoms or molecules in 0.30 mol F
Answer:
4.214 x10 23 atoms
Explanation:
.7 x (6.02x 10 23)
for every mol there is
6.02 e 23 atoms so if you multiply both you get the atoms
Define the term valence electrons
Answer:
Valence electrons are the number of electrons in an outer shell of an atom that can participate in forming chemical bonds with other atoms.
What is voltage? A. The pressure that pushes electrons to the anode; it is derived from the negative charge of electrons at the cathode. B. None of these C. The speed of the electrons flowing to the anode; it is determined by the type of metal the electrodes are made of. D. The pressure that pushes electrons to the cathode; it is derived from the negative charge of electrons at the anode.
Answer:
D
Explanation:
I think it's D but not 100% sure
The pressure that pushes electrons to the cathode is derived from the negative charge of electrons at the anode. Hence, option B is correct.
What is an electrolytic cell?An electrolytic cell is a type of electrochemical cell that undergoes non-spontaneous reactions by deriving the energy in the form of voltage from external sources.
A voltaic cell is a cell in which chemical reactions are used to produce electrical energy in form of current.
Such a cell is made up of two electrodes and their electrolytes. The electrodes are connected via a salt bridge. The salt bridge allows electrons to move between the electrodes.
In a voltaic cell, an oxidation reaction occurs in the anode. During oxidation, electrons are produced. Therefore, the Na electrode in the anode will lose an electron spontaneously. At the cathode, reduction occurs. The Iron electrode here will gain the electron produced by the oxidation reaction at the anode. The salt bridge moves the electrons from the anode to the cathode.
Hence, the pressure that pushes electrons to the cathode is derived from the negative charge of electrons at the anode.
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Which of the following 1.0 M solutions con-
tains the most particles?
1. glucose
2. ethylene glycol
3. magnesium sulfate
4. potassium chloride
5. sodium sulfate
The most soluble substances gives more number of particles in solution. 1.0 M of sodium sulphate contains most particles here.
What is solubility?Solubility of a solute is the fraction of its concentration which is dissolved in a solvent. When solutes dissolved in solvent the dissociates into ions.
Solubility of a substance depends on the temperature, pressure, bond type and molecular weight of the compound. The no.of particles produced by a molecule when dissolved vary from compound to compound.
Glucose and ethylene glycol partially dissolves in water and they give only one particle as such and does not form ions.
Potassium chloride gives one K⁺ ions and Cl⁻ ions and magnesium sulphate gives one Mg²⁺ and SO₄²⁻ ions. Whereas, sodium sulphate (Na₂SO₄) gives two sodium ions and one sulphate ion.
Hence, more particles are produced when sodium sulphate is dissolved in water. Therefore, 5th option is correct.
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BONUS QUESTION
you are stuck with a problem. You need to measure pH of a solution known to be made from a metal hydroxide, but you don't have a meter or any indicators. You do happen to have some lead(II) nitrate that is soluble, and you remember that lead (II) hydroxide is insoluble. You add some to 1 liter of your own unkown solution and a precipitate forms. You add more unttil the precipitate stops forming and then a bit more just in case. After you filter and dry the precipitate, you have 3.81 grams of it. What was the approximate pH of the original solution?
*This is just a bonus question but I'm very confused on it so any help would be appreciated*
Answer:
pH = 12.5
Explanation:
The reaction that takes place is
2OH⁻(aq) + Pb⁺²(aq) → Pb(OH)₂(s)The OH⁻ species come from the metal hydroxide of the solution, and Pb(OH)₂ is the precipitate.
Now we convert 3.81 grams of Pb(OH)₂ into moles, using its molar mass:
3.81 g ÷ 241.12 g/mol = 0.0158 mol Pb(OH)₂Now we convert 0.0158 Pb(OH)₂ moles into OH⁻ moles, using the stoichiometric coefficients of the reaction:
0.0158 mol Pb(OH)₂ * [tex]\frac{2molOH^-}{1molPb(OH)_2}[/tex] = 0.0316 mol OH⁻With the given concentration (1 L), we calculate [OH⁻]:
[OH⁻] = 0.0316 mol / 1 L = 0.0316 MThen we calculate the pOH of the solution:
pOH = - log[OH⁻] = 1.5And finally we calculate the pH:
pH = 14 - pOHpH = 12.5Iron has a density of 7.31 g/cm3.what is the mass of 2.25 cm3 of sodium?
7.9 g/cm3 is the density of iron. There are three possibilities: 1.3 × 103 g 2.3 × 10-2 g 4.3 × 102 g 2.1 × 104 g 1.4 g.
What is the density of iron?Iron has a density of 7.874g/cm3.
At atmospheric pressure, different substances have their typical densities.
The mass per unit volume is the definition of density. Mathematically speaking, its intense attribute is defined as mass divided by volume:
ρ = m/V
The total mass (m) of a material divided by the total volume (V) . it occupies is how a substance is defined as having a density (). The kilogram per cubic meter (kg/m3) is the metric unit used by the SI. The pounds mass per cubic foot (lbm/ft3) measurement is used in Standard English.
Compressibility (also known as the coefficient of compressibility is a measure of the relative volume change of a fluid or solid as a response to a pressure (or mean stress) change.
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Argue whether this chemical reaction supports or does not support the Law of Conservation of Matter.
Make sure to explain and justify your answer.
A researcher combines 28g of Magnesium and 15g of Oxygen.
The mass of the substances after the chemical reaction is 32g.
Explanation:
The reaction is as follows:
2Mg(s) + O2(g) ---> 2MgO(s)
and the researcher said that 32 g of MgO was produced.
Stoichiometry:
28 g Mg × (1 mol Mg/24.305 g Mg) = 1.15 mol Mg
15 g O2 × (1 mol O2/15.999 g O2) = 0.938 mol O2
1.15 mol Mg × (2 mol MgO/2 mol MgO) = 1.15 mol MgO
1.15 mol MgO × (40.3044 g MgO/1 mol MgO) = 46.6 g MgO
0.938 mol O2 × (2 mol MgO/1 mol O2) = 1.88 mol MgO
1.88 mol MgO × (40.3044 g MgO/1 mol MgO = 75.6 g MgO
Based on these numbers, the amount of product after the reaction is much less than expected so these results don't seem to support the law of conservation of matter.
How is dinitrogen (1) oxide distinguished shed from oxygen
Answer:
See Explanation
Explanation:
Both oxygen and dinitrogen (1) oxide are known to rekindle a glowing splint. However, oxygen is an odorless gas while dinitrogen (1) oxide has a faint smell and has an effect on the central nervous system.
Also, the combustion of dinitrogen (1) oxide produces brown fumes of nitrogen IV oxide.
Finally, when dinitrogen (1) oxide and oxgen are both heated with copper, residual nitrogen gas is left with dinitrogen (1) oxide while no residual gas is left with oxygen.
consider this a reaction 2H+ + CO3²- → H₂O + CO₂ . Identify each of the following as a product, a reactant, or a coefficient.
The reactant, product and coefficient of the chemical equation are 2H⁺ and CO₃², H₂O and CO₂ and 2 respectively. Chemical reaction is the reaction between two or more substances to form a new substance.
How do you identify a product and reactant?The left side of the equation lists reactants as the initial materials. The right-hand side of the equation lists the products, which represent the outcome of the reaction. Products are the compounds created during a chemical reaction, whereas reactants are the substances that cause the reaction. The general chemical formula can be used to express a chemical reaction. During chemical reactions, bonds disintegrate and reassemble. Additionally, the reverse response takes place. Reactants and products are involved in every chemical reaction. In a combustion reaction, the reactants are air and candle wax. Products are the compounds created during a chemical reaction, whereas reactants are the substances that cause the reaction.To learn more about product and reactant refer to:
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How many moles are in 3.555 g of c2h2?
Answer:
0.13653499904751903
Explanation:
Convert Units .com
In class we derived the Gibbs energy of mixing for a binary mixture of perfect gases. We also discussed that the same result is obtained for liquids when the resulting solution is ideal. For real solutions we introduced activities and activity coefficients. Derive the molar Gibbs energy of mixing and the molar excess Gibbs energy of mixing in terms of activity coefficients.
Answer:
Attached below
Explanation:
Free energy of mixing = ΔGmix = Gf - Gi
attached below is the required derivation of the
a) Molar Gibbs energy of mixing
ΔGmix = Gf - Gi
hence : ΔGmix = ∩RT ( X1 In X1 + X2 In X2 + X3 In X3 + ------- )
b) molar excess Gibbs energy of mixing
Ni = chemical potential of gas
fi = Fugacity
N°i = Chemical potential of gas when Fugacity = 1
ΔG = RT In ( a2 / a1 )
12. What is the empirical formula for C10H30O5?
I need some help with this
Answer:
1: b
2: in the article it says that the benefits from the drug outweigh the costs, so it think it is effective.
What is the density of a 1209 kg object that is 1.94 m3 in size?
Answer:
623 kgm^-3
Explanation:
Density = Mass/Volume
Mass = 1209 kg
Volume = 1.94 m^3
Density = 1209 / 1.94 kgm^-3
= 623.1958763 kgm^-3
= 623 kgm^-3 (3sf)
What is the pH of a 4.5 x 10 M HI solution?
Answer:
ik ppl sy no links but https://courses.lumenlearning.com/cheminter/chapter/the-ph-scale/
Explanation: it should help you
What is the formula for Iodine Pentafluride?
Answer:
It's IF5. ................
Clouds most likely form as a result of
Answer:
Some clouds form as air warms up near the Earth's surface and Rises heated by Sunshine the ground heats the air just above it that warm air starts to rise because when warm it is lighter and less dense than the air around it as it rises its pressure and temperature drop causing water vapor to condense.
When airborne water vapor condenses into observable water droplets or ice crystals, clouds are created.
Condensation is most likely the cause of cloud formation. The transformation of airborne water vapor into a liquid or solid state is known as condensation. When the air is cooled or the pressure of the water vapor is raised, this occurs.
Water vapor from the Earth's surface is constantly evaporating into the atmosphere. When this water vapor rises, it cools in the atmosphere. The pressure of water vapor rises as the air cools. Water vapor will condense on minute airborne particles like dust, pollen, or salt crystals when the water vapor pressure reaches a particular level.
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Rocky objects that are massive enough will have a spherical shape due to the force of gravity. (no links or else I will report you)
True
False
Which block of elements is non-reducing?
Answer: S-block elements
Explanation: Elements of S-block are prepared through the electrolysis process not by the reduction of their compounds with the other group elements of their compounds. For example in Carbon dioxide carbon is non reducing because oxidation state of `C "in" CO_(2)` is `+4`, which is maximum So it does not undergo oxidation, and hence, it is not a reducing agent.
When air moves in small circular patterns, it moves within a
Answer:
Convection
Explanation:
3. Which of the following chemical equations is balanced? *
N2+H2 → NH3
N2+3H2→ 3NH3
N2+3H2→ 2NH3