Ch.10 The Mole Quiz

What is the molar mass of Cu(NO₃)₂?

• 187.56 g/mol

• 125.55 g/mol

• 93.55 g/mol

• 155.23 g/mol

How many moles are present in 118.6 grams of carbon dioxide?

• 2.69moles

• 5219.59 moles

• 118.60 moles

• 0.73 moles

Find the mass of 5.2 mols of NiCl₂

How many atoms of oxygen are in 30.0 grams of silicon dioxide?

• 6.01 x 10²³ atoms

• 3.01 x 10²³ atoms

• 1.8 x 10²⁵ atoms

• 1.09 x 10²⁷ atoms

How many moles is in 8.40 grams of cobalt(II) nitrate.

• 182.9 moles

• 8.40 moles

• 0.0459moles

• 21.77 moles

A compound consists of 52.925% aluminum and 47.075% oxygen by mass. What is the empirical formula?

• Al₂O₃

• Al₃O₂

• AlO

• AlO₂

A type of silver compound has a molar mass of 339 g/mol. Its percent composition is: 63.499% silver, 8.245% nitrogen, and 28.255% oxygen. What is the molecular formula for the compound?

What is the chemical formula for calcium sulfate hexahydrate?

• CaSO₄ * 6H₂O

• Ca₂(SO₄)₃ * 6H₂O

• Ca(SO₄)₂ * 6H₂O

• CaSO₄ * 5H₂O

How are anhydrous compounds different from hydrates?

• Anhydrous compounds contain more water molecules than hydrates

• Anhydrous compounds and hydrates are the same

• Anhydrous compounds do not contain water molecules, unlike hydrates

• Anhydrous compounds use Greek letters to indicate the number of water molecules present

What is the molar mass of H₂O?

• 18.02 g/mol

• 20.02 g/mol

• 16.00 g/mol

• 22.99 g/mol