Quiz about Stoichiometry

Question 1

Which expression can be used to solve a mass-to-mole conversion for the equation HCL -----> H₂ + Cl₂? Given: Mass of HCl and unknown: Mol of Cl2

Accepted Answer

$$mass\ HCl\ x\ \frac{1\ mol\ HCl}{molar\ mass\ HCl}\ x\ \frac{1\ mol\ Cl2}{2\ mol\ HCl}$$

Answer

$$mass\ HCl\ x\frac{1\ mol\ Cl2\ }{2\ mol\ HCl}$$

Question 2

In the reaction represented by the equation CH4(g) + O2(g) ----> CO₂(g) + H₂O(g), a mass of 125 g CH₄is reacted with excess oxygen. The expression:

$$125\ g\ CH_{4\ } imes\frac{1\ mol\ CH_4}{16.05\ g\ CH_4} imes\frac{2\ mol\ H_2O\ }{1\ mol\ CH_4} imes\frac{18.20\ g\ H_2O}{1\ mol\ H_2O}$$

is used to calculate the:

Accepted Answer

mass of water produced.

Answer

mass of oxygen redacted.

Answer

mass of carbon dioxide produced.

Answer

none of the above.

Question 3

What is the mole ratio of H2O to H3PO4 in the following chemical equation?

$$P_4O_{10}+6H_2O\ \rightarrow\ 4H_3PO_4$$

Accepted Answer

3 to 2

Answer

1 to 6

Answer

4 to 6

Answer

2 to 3

Question 4

Knowing the mole ratio of a reactant and product in a chemical reaction would allow you to determine:

Accepted Answer

the mass of the product produced from a known mass of reactant.

Answer

the energy released in the reaction.

Answer

the speed of the reaction.

Answer

whether the reaction is reversible.

Question 5

In the equation $$6CO_2+6H_2O\ \rightarrow\ C_6H_{12}O_6+6O_2$$ the mole ratio of water to oxygen is:

Accepted Answer

1 : 1

Answer

2 : 1

Answer

3 : 2

Answer

6 : 8

Question 6

In the equation $$Al_2\left(SO_4\right)3+3Ca\left(OH\right)_2\ \rightarrow\ 3CaSO_4\ +2Al\left(OH\right)_3$$ , , the mole ratio of calcium hydroxide to aluminum hydroxide is:

Accepted Answer

3 : 2

Answer

1 : 3

Answer

2 : 3

Answer

1 : 1

Question 7

For the reaction represented by the equation $$N_2+3H_{2\ }\rightarrow\ 2NH_3$$ , how many moles of nitrogen (N2) are required to produce 18 grams of ammonia (NH3)?

Accepted Answer

0.53 mol

Answer

0.9 mol

Answer

18 grams

Answer

36 grams

Question 8

The most steps are required to solve stoichiometry problems when the reactant is given in grams and the product is sought in

Accepted Answer

grams.

Answer

moles.

Answer

liters.

Answer

number of atoms.

Question 9

Fill in the steps required to find the number of grams of substance B produced from the number of grams of substance A:

grams of A $$\rightarrow$$ ________ $$\rightarrow$$ _______ $$\rightarrow$$ ______= grams of B.

Accepted Answer

$$\frac{1\ mol\ of\ A}{Molar\ Mass\ of\ A^3};\ \frac{Moles\ of\ B}{Moles\ of\ A};\ \frac{Molar\ Mass\ of\ B}{1\ mol\ of\ B}$$

Answer

$$\frac{1\ mol\ of\ A}{Molar\ Mass\ of\ A^3};\ \frac{Molar\ Mass\ of\ B}{1\ mol\ of\ B};\ \frac{Moles\ of\ B}{Moles\ of\ A}$$

Question 10

For the reaction represented by the equation $$Pb\left(NO_3\right)_2+2KI\ \rightarrow\ PbI_2+2KNO_3$$ how many moles of lead iodide $$\left(PbI_2\right)$$ are produced of 300 grams potassium iodide $$\left(KI\right)$$ when $$Pb\left(NO_3\right)_2$$ is in excess?

Accepted Answer

0.904 mol PbI₂

Answer

114.78 mol PbI₂

Answer

0.904 grams PbI₂

Answer

114.78 grams PbI₂

Question 11

For the reaction represented by the equation $$2KClO_3\rightarrow\ 2KCI+30_2$$ how many grams of potassium chlorate are required to produce 160. g of oxygen?

Accepted Answer

804 g KClO₃

Answer

408 g KClO₃

Answer

598 g KClO₃

Answer

There is not enough information.

Stoichiometry

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