DK 014 - mole concept

Calculate the molar mass of (sodium carbonate decahydrate), Na₂CO₃.10H₂O

• 286.14 g/mol
• 270.92 g/mol
• 300.78 g/mol
• 284.56 g/mol

Calculate the number of moles of 8200 g of iron.

• 300.45 mol
• 205.67 mol
• 92.34 mol
• 146.86 mol

Calculate the number of atoms in 0.6144 mol of copper

• 2.345 x 10²³atoms

• 6.789 x 10²³ atoms

• 3.695 x 10²³ atoms

• 4.567 x 10²³atoms

Calculate the mass in grams of 3.29 x 10^-1 mol of lithium.

• 4.56
• 1.78
• 0.93
• 2.28

Calculate the number of atoms in 0.082 g of gold.

• 2.51 x 10²⁰ atoms

• 5.63 x 10¹⁸ atoms

• 1.45 x 10²¹ atoms

• 3.72 x 10¹⁹ atoms

Calculate the number of moles of 6.022 x10²⁴ atoms of cobalt.

• 0.5 moles
• 5 moles
• 20 moles
• 10 moles

Calculate the number of moles in 7.04 g of lead(II) nitrate, Pb(NO₃)₂

• 0.0426 moles
• 0.0187 moles
• 0.0352 moles
• 0.0213 moles

Calculate the mass of a 8.22 x 10²³ atoms of rubidium.

• 116.76 g

• 200.3 g

• 150 g

• 127.76 g

Calculate the number of molecules of 1.500  x 10³ mol of hydrazine, N₂H₄

• 2.500 x 10²⁶

• 9.033 x 10²³

• 9.033 x 10²⁶

• 1.500 x 10²⁴

Calculate the number of molecules in 285 g of iron(III) phosphate, FePO₄

• 1.14 x 10²⁴

• 7.89 x 10²⁴

• 3.14 x 10²⁴

• 5.72 x 10²⁴