A solution contains an unknown amount of dissolved magnesium. Addition of
0.0877 mol of Na2CO3 causes complete precipitation of all of the magnesium.
What mass of magnesium was dissolved in the solution?

Answer:

the alteration of limestone by heat and pressure.

Explanation:

Answer:

YES :)

Explanation:

How does marble turn back into Limestone?

»MARBLE is a Metharopic rock formed by the alternation of Limestone by heat and pressure

»The calcite in the limestone changes and fosills and layering in the original limestone disappear as interlocking grains grow.

»If the limestone is pure ,a white marble is formed

Answer:

.5 kg

Explanation:

At the start of Uranium-235 there is a total of 1 kg. Uranium-235 half life is 700 million years, take 1kg ÷2 = 0.5kg after 1 half life.

Let's say another 700 million years go by that means you take 0.5kg and divide that by 2.

0.5kg÷2= 0.25 kg is left after 2 half lives.

Hope this helps good luck!

Answer:

B.6

Explanation:

Organism is at the top and does not get eaten by anything else. That is why I think the correct answer is b :)

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Answer:

the statement is a theory

Explanation:

Answer:

picture

Explanation:

i need the picture

we need a picture to

answer this sire

Answer:

.107 moles

Explanation:

To find moles given the info above, we use a variation of the Ideal Gas Law,

mol = PV/RT, where P is in atm, V is in L, T is in K, and R is the gas constant

mol= 3.47(.950) / 377(.08206)

Answer:

Option B: Oxygen.

Explanation:

Hope this helped.

mass of the sample gold= 38.6g

volume =

[tex]2 {cm}^{3} [/tex]

the density of the gold.

D = m/V

[tex]m = 38.6g[/tex]

[tex] = 0.0386kg[/tex]

[tex]v = 2 {cm}^{3} [/tex]

[tex] = 0.000002 {m}^{3} [/tex]

then substitute the values.

[tex]d = \frac{0.0386}{0.000002} [/tex]

[tex]d = 19300kg | {m}^{3} [/tex]

therefore, the density of the sample gold is 19300kg/m3

Answer: 4.4 x 10^-7

Explanation:

The dissociation equation for this reaction is:

MgCO3 (s) → Mg+2 (aq) + CO3-2 (aq)

[tex]\text { So, } k_{s p}=(x+0.08) x[/tex] (Here 0.08 >>> x )

[tex]\begin{aligned}\Rightarrow 3.5 \times 10^{-8} &=0.08 \times x \\\Rightarrow x &=\frac{3.5}{0.08} \times 10^{-8} \\&=4.37 \times 10^{-7} \\\Rightarrow x & \approx 4.4 \times 10^{-7} \mathrm{~M}\end{aligned}[/tex]

So the solubility MgCO₃ in a solution that containing 0.080 M Mg²⁺ is 4.4 x 10^-7

the volume of ammonia produced at STP.

Mass of hydrogen is 32.6g

Molar mass of H2 = 2 g/mol

Moles of H = 32.6g/2g/mol = 16.3mol

N2(g) + 3H2(g) —-> 2NH3(g)

The Mole ratio of H to NH3 is 3 : 1

32.6 mole of H = 1/3 x 16.3= 10.87 mol = 5.43mol

Moles of NH3 = 5.43mol

At STP moles = volume/molar volume, but molar volume = 22.4L/mol

Moles = volume/molar volume, volume = moles X molar volume

Volume = 5.43 mol x 22.4L/mol

= 121.63 L

Volume of NH3 = 121.63L

Answer:

The answer is aluminum foil.

Answer:

Answer:

There are 7 electrons in the nitrogen atom two in k shell and 5 in l shell

Explanation:

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nebula

All stars start in a large cloud of dust and gas called a nebula. Gravity can pull some of the gas and dust in a nebula together, forming a proto-star. A star is born when the gas and dust from a nebula become so hot and dense that hydrogen atoms are smashed together to form helium.

hope this helps...

Answer:

Answer A  

Explanation:

2 H2  +  O2  = 2 H2O  

  knowing the mole weights of these elements shows O2 is the limiting reactant in this situation.

4 g oxygen is  4 /31.998  = .125 mole O2

  We should get two times these moles of water = .250 moles

         weight = .250 (1.008 * 2  + 15.999) =  4.50 gm H20   (theoretical)

   ....but we only got 4 gm

4/4.50  =  88.8%  

Dancing is a physical activity which strengthens the abdominal and calf muscles as well as improves flexibility.

A physical activity is any activity which involves movement of the body in order to strengthen the muscles and to be physically fit.

Dancing is a physical activity which involves intricate and repeated movements of the body.

Dancing is beneficial because;

Some muscles involved in dancing include;

Some risks in dancing include muscle injuries, dislocations and possibly fractures due to falls.

Therefore, a dancing routine strengthens the abdominal and calf muscles as well as improves flexibility.

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An ionic bond will be most likely formed between francium and chlorine having an electronegativity difference of 2.46.

An ionic bond is formed between to atoms that have a high difference in electronegativity between them. We now have to look out for the atoms that have a very high electronegativity difference. That pair is most likely to form an ionic bond.

Hence, an ionic bond will be most likely formed between francium and chlorine having an electronegativity difference of 2.46.

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Answer:

3.8 M

Explanation:

Mole weight of LiCl = 6.94 + 35.45 = 42.39    ( from periodic table)

175 g of this is then   175 / 42.39  = 4.13 moles

4.13 moles / (1085/1000) = 3.8 M

Answer:

3.8 g

Explanation:

yan lng po maitutulong ko

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 2.34moles of potassium chloride will be produced from 175 g of potassium chlorate.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

mole =given mass ÷ molar mass

Molar mass of potassium chloride= 74.55 g/mol

Mass of potassium chloride= 175 g

Substituting the values in above formula we get

mole =175 g ÷  74.55 g/mol

moles of potassium chloride=2.34moles

Therefore, 2.34moles  of potassium chloride will be produced from 175 g of potassium chlorate.

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Answer:

See below ~

Explanation:

#1

Here the functional group attached is OH(Alcohol) so we need to use -ol suffix

Right hand side is 2 carboned substituent i.e it's ethyl group

Hence the naming is

#2

Start numbering from alcohol towards left end .

The name is

#3

O is at centre and two methyl groups are branched both sides

#4

O is at centre,left side propane ,right side methane

#5

Left side ethane,Centred O,Right side methyl.

Without conducting an experiment, one can determine if a species in a solution is acidic or basic by using a litmus paper.

Acidic species would turn a blue litmus paper to red but have no effects on red litmus paper.

Basic species would turn a red litmus paper to blues but have no effects on blue litmus paper.

Thus, in order to determine if a species in a solution is acidic or basic without conducting any experiment, dipping a litmus paper into the solution would give an indication.

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Answer:

When myocytes (aka muscle cells) are triggered at a certain point for awhile it can cause strain and pain throughout the muscle.

Answer:

Rate=k[N2O5]^2

Explanation:

It is more accurate to determine the rate law using experimental data instead of stoichiometry. The answer I just gave was derived from stoichiometry.

The correct expression for the rate of the reaction [tex]\rm 2N_2O_5(g) ---- > 4NO_2(g)[/tex]+ O2(g) is Rate = Δ[[tex]\rm N_2O_5[/tex]] / (2Δt). Therefore, the correct option is B.

In the chemical equation, 2 moles of [tex]\rm N_2O_5[/tex]result in 4 moles of [tex]\rm NO_2[/tex]. The rate expression for the reaction can be expressed on the basis of stoichiometry as follows:

Rate = -Δ[[tex]\rm N_2O_5[/tex]] / (2Δt)

Because of the stoichiometric coefficient of 2, this expression shows that the rate of reaction is equal to the rate of decomposition of [tex]\rm N_2O_5[/tex]divided by 2. Since [tex]\rm N_2O_5[/tex]is a reactant in the forward process, the negative sign means that its concentration is decreasing with time. ,

Therefore, the correct option is B.

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Your question is incomplete, most probably the complete question is:

For the reaction 2N2O5(g) → 4NO2(g) + O2(g) which of the following expressions is equal to the rate of the reaction?

A) Rate = -Δ[N2O5] / Δt

B) Rate = Δ[N2O5] / (2Δt)

C) Rate = -Δ[NO2] / Δt

D) Rate = Δ[NO2] / (4Δt)

Explanation:

The number of moles of a substance is represented by the following formula:

n=NNA

where, n

is the number of moles of the substance, N

is the total number of molecules present in a substance, andNA

is the Avogadro constant.

The given compound is N2O5

So one mole of N2O5

contains 6.023×1023

numbers of molecules. Thus the 0.400

moles of N2O5

contains a number of molecules => 0.400moles×6.023×10^23

.

=> 2.41×10^23 molecules.

there are 2.41 thats the anwser

Answer:

formation of an ester by condensation

Explanation:

Edge 2022

Looking at the reaction sequence as described in the question, the ester can be said to be formed by condensation.

A condensation reaction is one in which a new compound is formed by the loss of a small molecule such as water from the two reacting compounds.

Looking at the reaction sequence as described in the question, the ester can be said to be formed by condensation. Hydrogen ion is lost from the first compound and -OH from the second one which is an instance of condensation.

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The major product of the reaction between  acetic anhydride and CH3CH2CH2OH is CH3COOCH2CH2CH3. While, the major product of the reaction between acetic anhydride and NH3 is CH3CONH2.

Acetic anhydride is the compound (CH3COO)2. It is a precursor for the synthesis of many organic compounds.

Now let us consider the use of acetic anhydride in synthesis. The major product of the reaction between  acetic anhydride and CH3CH2CH2OH is CH3COOCH2CH2CH3. While, the major product of the reaction between acetic anhydride and NH3 is CH3CONH2.

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1. Acids have highest concentration of hydronium ions.

2. Bases have highest concentration of Hydroxide ions

3. a. less than 7 b. more than 7

4. Acids (Presence of hydronium ions)

You need Conclusions too?

Answer:

28.0855 grams per mole