1.

a) How many grams of H2 are needed to produce 10.29 g of NH3?

Express your answer numerically in grams.

b) How many molecules (not moles) of NH3 are produced from 7.3310⁴ g of H2?

Express your answer numerically as the number of molecules.

2. How many moles of KCl are contained in each of the following?

a) 0.511 L of a 2.5 molL1 KCl solution

Express your answer using two significant figures.

b) 1.9 L of a 0.80 molL1 KCl solution

Express your answer using two significant figures.

c) 114 mL of a 1.66 molL1 KCl solution

Express your answer using three significant figures.

3. Each of the following compounds is soluble in water. For which compounds do you expect the resulting aqueous solution to conduct electrical current?

Check all that apply.

CsClCsCl

Ca(NO3)2Ca(NO3)2

CH2(OH)CH(OH)CH2(OH)CH2(OH)CH(OH)CH2(OH)

C2H5OH