Formula mass and mole calculations

Which of the following is an abbreviation for relative atomic mass?

• A_r

• M_r

• Z

What is the relative atomic mass of carbon? Use a periodic table to help you answer.

• 6

• 12

• 40

What is the relative formula mass of carbon dioxide?

• 44

• 22

• 28

What is the relative formula mass of ammonium nitrate, NH₄NO₃?

• 66

• 44

• 80

What is the relative formula mass of calcium hydroxide, Ca(OH)₂?

• 74

• 54

• 80

What name is given to the number of atoms in a mole of an element?

• Planck's constant

• Avogadro's constant

• Newtonian constant

How many moles are there in 9 g of water?

• 2

• 1

• 0.5

What is the mass of 3 moles of ammonia, NH₃?

• 17 kg

• 51 kg

• 51 g

According to the chemist Avogadro, 1 mole of a substance contains how many particles?

• 6.02 x 10²³

• 3.02 x 10²³

• 6.02 x 10^-23

If burning 0.40 g of Mg produces 0.66 g of MgO, how much MgO is produced by burning 10 g of Mg?

• 1.65 g

• 16.5 g

• 6.06 g

• 10.60 g