Question

If 5.00 mol of NaCl and 10.0 mol of H2SO4 react, how many moles of HCl will be produced?

NaCl + H2SO4 ---> NaHSO4 + HCl

A few extra questions….

a. What is the limiting reactant?

b. What reactant is in excess?

c. How much of the excess reactant is left over (in grams)?

d. What mass of the other product (NaHSO4) will be made?

Answer 1

Answer:

H

2

SO

4

+2NaOH→Na

2

SO

4

+2H

2

O

The molar masses of H

2

SO

4

and NaOH are 98 g/mol and 40 g/mol respectively.

Number of moles is the ratio of mass to molar mass.

Number of moles of H

2

SO

4

=

98

49

=0.5 moles

Number of moles of NaOH =

40

80.0

=2 moles

0.5 moles of H

2

SO

4

will react with 2×0.5=1.0 mole of NaOH.

2−1=1 mole of NaOH will remain unreacted. This corresponds to 1×40=40g.