Mole calculations

Calculate the number of gold atoms in a 4 mole sample of gold.

• 2.41x10²⁴
• 3.01x10²³
• 4.82x10²⁴
• 6.02x10²³

Calculate the mass of iron in a sample of iron ore containing 2.61x10²³ iron atoms.

• 0.433g
• 24.2g
• 44g
• 6.02g

Calculate the number of moles of chlorine atoms in 55g of copper chloride.

• 0.409 moles
• 0.818 moles
• 1.550 moles
• 2.201 moles

Calculate the number of moles of Aluminium in a 2.04 mole sample of aluminium oxide.

• 2.04 moles
• 4.08 moles
• 6.12 moles
• 1.02 moles

Calculate the mass of oxygen present in a 55g sample of Aluminium oxide.

• 29.28
• 19.95
• 11.36
• 32.33

Calculate the mass of HCl required to produce 22L of H₂ gas when mixed with excess zinc.

• 70.62g
• 35.31g
• 105.93g
• 0.969g

Calculate the mass of NaOH required to produce 45g of NaCl when mixed with HCl.

• 30.79g
• 15.39g
• 61.58g
• 45.60g

Calculate the % composition by mass of oxygen present in H₂SO₄.

• 16.3%
• 65.25%
• 32.6%
• 57.14%

Which of the following is not produced by the combination of CaCO₃ and H₂SO₄.

• CO₂
• H₂O
• CaSO₄
• H₂CO₃

Calculate the number of oxygen atoms present in 14kg of Ba(NO₃)₂

• 53.578 atoms
• 3.22x10²⁵ atoms
• 3.22x10²² atoms
• 6.44x10²² atoms