Question

Convert 530 grams of Sodium carbonate (Na2CO3) into moles of Sodium carbonate (Na2CO3)

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Convert 4.2 moles of H2O into grams of H2O
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How many moles are in 12.04 x 10^23 particles of O2 ?
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How many particles are in 3 moles of magnesium (Mg)?

Answer 1

1. 5 moles

2. 75.6 grams

3. 2 moles

4. 1.806 x 10²⁴ particles

Further explanation

Given

mass and moles of compound

Required

mass, moles and number of particles

Solution

1. 530 g Na2CO3

mol = 530 g : 106 g/mol

mol = 5

2. 4.2 moles H2O

mass = 4.2 moles x 18 g/mol

mass = 75.6 grams

3. 12.04 x 10²³ O2

mol = 12.04 x 10²³ : 6.02 x 10²³

mol = 2

4. 3 moles of Mg

particles = 3 x 6.02 x 10²³

particles = 1.806 x 10²⁴