CHEMISTRY HIGH SCHOOL

Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)Starting with with 50.0 grams of Pb(NO3)2 and 30.0 grams of NaI:
A. What is the limiting reagent?
B. How many grams of the excess reactant remains?
C. How many grams of each product is formed?
D. If 12 grams of NaNO3 actually formed in the reaction, what is the percent yield of this reaction?

Answers

Answer 1

Answer:

Answer:

Explanation:

Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)

MM for each compound -

Pb(NO3): 207 + 14x2 + 16x3x2 = 331

PI2: 207 + 127x2 = 461

NaI: 23 + 127 = 150

NaNO3: 23 + 14 + 16x3 = 85

Moles of Pb(NO3)2 = 50/331 = 0.15

Moles of NaI = 30/150 = 0.2

Ratio of moles is 1:2

So NaI is limiting

Limited to 0.2/2 = 0.1 mole of Pb(NO3)2

Excess = 0.15 - 0.1 = 0.05 mole

Mass remains = 0.05x331 = 16.55 grams

Moles of NaNO3 formed = Moles of NaI reacted = 0.2

Mass = 0.2x85 = 17 grams

Moles of PbI2 formed = Moles of Pb(NO3)2 reacted = 0.1

Mass = 0.1x461 = 46.1 grams

If 12 grams of NaNO3 actually formed in the reaction,

percent yield = 12/17x100% = 70.6%

Answer 2

Answer:

Answer:

Explanation:

Moles of Pb(NO3)2 = mass/molecular mass

= 50.0 grams/(207.20*1 + 14.01*2 + 16*6)

= 50.0 grams/331.22

= 0.15 moles

Moles of NaI

= 30/(22.99+126.9)

= 30/149.89

= 0.2 Moles

A. NaI is less 2x Pb(NO3)2 so NaI is the limiting reagent.

B. The ratio is 1 to 2 so there is 0.15 - 0.2/2 = 0.05 mole

or 16.78 grams of Pb(NO3)2 left.

C. As NaI is limiting, only 0.2 Moles of NaNO3 is formed.

Mass = Moles * Molecular Mass

Molecular Mass of NaNO3 can be calculated as:

Na - 22.99

N - 14.01

O - 3(16) = 48

23+14+48 = 85gram / mole

Thus, Mass = 0.2*85 = 17 gram of NaNO3

Mass is conserved in a chemical reaction.

Mass of PbI2 can be calculated as:

50+30-16.78-17

= 46.3 gram of PbI2

Mass =

12.75

Thus, 12.75g of Sodium Nitrate can be formed

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The involuntary muscles of the arteries are controlled by the nervous system. The correct option among all the options that are given in the question is the third option or the penultimate option. these muscles are not directly under the control of any person and so are called involuntary muscles. I hope the answer helps you.

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Have a good day!!

Chemistry Questions 3. What is true of a strong acid? A. It ionizes close to 100% in water B. It is a weak electrolyte C. It does not conduct electricity in solution D. It always has a high concentration 4. What substance is acting as the Bronsted-Lowry base in the forward reaction below? H2O + HCl --> H3O+ + Cl- A. H3O+ B. Cl- C. H2O D. HCl 5. Which of the following is NOT an acid-base neutralization reaction? A. NH3 + HCl --> NH4Cl B. NaOH + CH3COOH --> Na CH3COO + H2O C. 2 HNO3 + Ca(OH)2 --> Ca(NO3)2 + 2 H2O D. H2SO4 + 2 NaCl --> 2 HCl + Na2SO4

Answers

Answer:

For 3: The correct answer is Option A.

For 4: The correct answer is Option C.

For 5: The correct answer is Option D.

Explanation:

For 3:

There are 2 types of solutions on the basis of pH.

An acid is defined as the chemical substance which looses hydrogen ions in a solution.

A weak acid does not completely dissociates into its ions but a strong acid completely dissociates into its ions when dissolved in water.

A base is defined as the chemical substance which looses hydroxide ions in a solution.

A weak base does not completely dissociates into its ions but a strong base completely dissociates into its ions when dissolved in water.

Hence, the correct answer is Option A.

For 4:

According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a substance which accepts protons.

For the given chemical equation:

$H_2O+HCl\rightarrow H_3O^++Cl^-$

$H_2O$ is considered as a bronsted-lowry base because it is accepting hydrogen ion to form hydronium ion

HCl is considered as a bronsted-lowry acid because it is donating hydrogen ion to form chloride ion.

Hence, the correct answer is Option C.

For 5:

Neutralization reaction is defined as the chemical reaction in which an acid reacts with a base to produce a salt and water molecule.

$HX+BOH\rightarrow BX+H_2O$

For the given options:

Option A:

The chemical equation follows:

$NH_3+HCl\rightarrow NH_4Cl$

This is an example of neutralization reaction because ammonia is considered as a base and when it reacts with HCl, it leads to the production of salt.

Option B:

The chemical equation follows:

$NaOH+CH_3COOH\rightarrow CH_3COONa+H_2O$

This is an example of neutralization reaction.

Option C:

The chemical equation follows:

$2HNO_3+Ca(OH)_2\rightarrow Ca(NO_3)_2+2H_2O$

This is an example of neutralization reaction.

Option D:

The chemical equation follows:

$H_2SO_4+2NaCl\rightarrow 2HCl+Na_2SO_4$

This is an example of double displacement reaction.

Hence, the correct answer is Option D.

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Answers

The theoretical yield of H2O if 130g of H2O is produced from 18g of H2 and an excess of O2 is 160g.

Answer: The theoretical yield of water is 162 grams.

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of hydrogen gas = 18 g

Molar mass of hydrogen gas = 2 g/mol

Putting values in equation 1, we get:

$\text{Moles of hydrogen gas}=(18g)/(2g/mol)=9mol$

The chemical equation for the formation of water from hydrogen gas and oxygen gas follows:

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As, oxygen gas is present in excess. It is considered as an excess reagent.

So, hydrogen gas is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

2 moles of hydrogen gas produces 2 moles of water

So, 9 moles of hydrogen gas will produce = $(2)/(2)* 9=9mol$ of water

Now, calculating the mass of water from equation 1, we get:

Molar mass of water = 18 g/mol

Moles of water = 9 moles

Putting values in equation 1, we get:

$9mol=\frac{\text{Mass of water}}{18g/mol}\n\n\text{Mass of water}=162g$

Hence, the theoretical yield of water is 162 grams.

1. The science that deals with heredity and the factors affecting the transmission of the characteristics is 2. The trait that is usually hidden and will just come out on the second generation is
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