Chemical Quantities - Quiz

What is the molar mass NaCl?

• 58 grams
• 22.95 grams
• 162 grams
• 6.02 x 10²³

How many atoms would be contained in 454 grams of iron?

• 6.02 x 10²³ atoms

• 8.14 atoms

• 4.89 x 10²⁴ atoms

• 55.9 x 10²³ atoms

If you want 1.55 moles of nitrogen trichloride, how many grams should you measure out?

• 0.0129 g

• 120. g

• 187 g

• 9.33 g

(0903) How many moles are in 74 g of KCl

• 0.99 mole

• 0.014 mole

• 11 moles

• 0.14 mole

What is the molar mass of Ca(NO₃)₂?

• 148.096 g

• 164.086 g

• 102.055 g

• 70.084 g

(0902) The mass of one mole of substance is called...

• molecular mass

• mole constant

• molar mass

• atomic weight

What is the percent by mass of magnesium in MgO?

• 20%
• 40%
• 50%
• 60%

What is the percent by mass of calcium in CaF₂ (gram-formula mass = 78 g/mol)?

• 24%
• 49%
• 51%
• 65%

In which compound is the percent composition by mass of Cl equal to 42%?

• HClO (gram formula mass = 52 g/mol)
• HClO₂ (gram formula mass = 68 g/mol)
• HClO₃ (gram formula mass = 84 g/mol)
• HClO₄ (gram formula mass = 100 g/mol)

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

•  NaPO2
• Na2PO3
• Na3PO4
• NaPO4