Moles Test Review

How many formula units of potassium chlorate are there in 1 mole of KClO₃?

• 1.024 x 10²⁴

• 6.022 x 10²³

• 22.4

• 122.548

Tags

NGSS.HS-PS1-7

The mass of 1 mole of hexane (C₆H₁₄) is ___________ ?

• 13.119 g/mol

• 6.022 x 10²³ g/mol

• 86.178 g/mol

• 5.19 x 10²⁵ g/mol

How would you calculate the molar mass of CaCl₂?

• Add the masses of 1 mole of calcium and 1 mole of chlorine

• Add the masses of 1 mole of calcium and 2 moles of chlorine

• Add the masses of 2 moles of calcium and 1 mole of chlorine

• Add the masses of 2 moles of calcium and 2 moles of chlorine

What is the molar mass of Al₂(CO₃)₃?

• 55.0 g/mol

• 114 g/mol

• 234 g/mol

• 1.20 x 10²⁴ g/mol

How many molecules are in 2.50 moles of H₂O?

• 1.51 x 10²⁴ molecules

• 4.15 x 10^-24 molecules

• 3.01 x 10²⁴ molecules

• 8.31 x 10^-24 molecules

How many Br^- ions are present in 1.00 moles of FeBr₃?

• 6.022 x 10²³

• 12.04 x 10²³

• 1.81 x 10²⁴

• 6.02 x 10²⁵

Tags

NGSS.HS-PS1-7

How many moles are there in 8.80 x 10²⁴ molecules of sodium sulfate, Na₂SO₄

• 1.40 moles

• 14.1 moles

• 51.2 moles

• 5.12 x 10⁴⁸ moles

A student has a 5.00 gram sample of calcium chloride (CaCl₂) solid. How many moles of calcium chloride are contained in the sample?

• 378 moles

• 0.0662 moles

• 555 moles

• 0.0451 moles

What mass of sulfur would have precisely 4.7 x 10²² atoms of sulfur?

• 6.02 gS

• 4.7 gS

• 2.5 gS

• 1.3 gS

What is an empirical formula?

I. A chemical formula

II. The lowest whole number ratio of atoms in a formula

III. The number of atoms present in one molecule of a compound.

• II only

• III only

• I and II

• II and III