9-3 Mols of Compounds

Multiple Choice

Which of the following statements is true about N₂O?

• The molecular mass is 30.

• One molecule of N₂O consists of one nitrogen atom and one oxygen atom.

• One mole of N₂O contains 6.02 x 10²³ atoms of nitrogen.

• One mole of N₂O consists of two moles of nitrogen atoms and one mole of oxygen atoms.

Multiple Choice

How many molecules are in 2.5 mol of NaCl?

• 1.51x10²³
• 146
• 4.15
• 1.51x10²⁴

Multiple Choice

What do the subscripts in a chemical formula indicate about the mole relationships?

• The number of molecules

• The number of atoms of each element

• The type of chemical reaction

• The temperature of the reaction

Multiple Choice

What is the molar mass of AlCl₃ based on the given sample?

• 133.251 g/mol

• 26.892 g/mol

• 106.359 g/mol

• 35.6 g/mol

Multiple Choice

How many grams are in 1.2 x 10²⁴ molecules of CO?

• 28 grams
• 56 grams
• 6.02 grams
• 1.2 grams