hello, i need help how to do this problems please.

Chapter 9 Worksheet
Stoichiometry
1. Consider the following equation:
As2O3 + 2 Cl2 + 5 H2O
2 H3AsO4 + 4 HCl
a. How many moles of H AsO can be produced from 3.37 mol of H O?
4

3

b.

2

How many grams of H O are needed to react with 0.789 mol of Cl ?
2

2

c. How many moles of As O are needed to produce 62.7g of HCl ?
2

3

d. How many grams of H AsO can be produced from 34.5 g of H O?
4

3

2

2. Consider the following equation:
2 Al + 3 Pb(NO3)2

2 Al(NO3)3 + 3 Pb

a. How many moles of Pb(NO ) are needed to produce 0.0124 mol of Al(NO ) ?
3

b.

2

3

How many moles of Pb(NO ) are needed to produce 15.4 g of Pb?
3

2

c. How many grams of A1(NO ) can be produce from 1.09 mol of Pb(NO )
3

d.

3

3

2

How many grams.of AI are needed to react with 142 g of Pb(NO ) ?
3

2

e. How many Pb atoms can be produced from 34.7 g of Pb(NO ) ?
3

2

f. How many grams of Pb(NO ) are needed to react with 1.23 x 1021 Al atoms?
3

2

3. Consider the following equation:

3

N +3H
2

2 NH
2

3

a. How many NH molecules can be produced from 10.3 g of N ?
2

3

b. How many grams of NH can be produced from 4.31 xl0
3

22

c. How many N molecules are required to produce 6.99 x 10
2

4. Consider the following equation:
Fe2O3 + 3 CO

H2 molecules?

24

NH molecules?
3

2 Fe + 3 CO2

a. If 100.0 g of CO reacts, how many grams of Fe can form?
b.
If 50.0 g of Fe are actually obtained when the reaction is run in the lab, what is the
percent yield?