Round-off the final answer to the correct number of significant figures in a box.

Question No. 1. Calculate the amount (mole) of NaCl present in 0.624 g NaCl.

Atomic Mass: Na = 22.99; Cl = 35.45

• What is the molar mass of NaCl? Round off your answer until the second decimal point. ( 3. pts)
• How many moles of NaCl are present in 0.624 g NaCl? ( 4pts)

Question No. 2. Calculate the mass (g) NaCl of 0.22 mole NaCl. (6 PTS)

Question No. 3

Consider a 250.0 mL aqueous solution that contains 1.624 mole NaCl.

• Write the mathematical equation for molarity. (2 PTS)

-Calculate the molar concentration of a 250.0 mL aqueous solution that contains 1.624 mole NaCl (4 PTS)