1) Using the balanced chemical equations, use unit-analysis to complete each pro

ID: 893522 • Letter: 1

Question

1) Using the balanced chemical equations, use unit-analysis to complete each problem. Show all work:

2Al (s) + 6HCl (aq) -> 2 AlCl3 (aq) + H2 (g)

a. How many moles of hydrogen gas (H2) can be produced from 4 moles of aluminum?

b. How many moles of hydrochloric acid is required to use up 3.5 moles of aluminum?

c. How many moles of hydrochloric acid must be connsumed in order to produce 0.15 moles of aluminum chloride?

2) How many grams of NaHCO3 are needed to make a 25.0 mL of 5.4 M sodium bicarbonate (NaHCO3) solution?

2Al (s) + 6HCl (aq) -> 2 AlCl3 (aq) + H2 (g)

a) moles of H2 gas from 4 moles of Al = 4/2 = 2 mol

b) moles of hydrochloric acid is required to use up 3.5 moles of aluminum = (6*3.5)/2 = 10.5 mol

c) moles of hydrochloric acid must be connsumed in order to produce 0.15 moles of aluminum chloride = (6*0.15)/2 = 0.45 mol

2) Molarity of NaHCO3 = moles of NaHCO3/Volume (in Ltr)

= mass of NaHCO3/ (Mol. mass of NaHCO3*Vol in Ltr)

grams of NaHCO3 required = 5.4M*84.007 g/mol 0.025 Ltr = 11.34 g

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