KS3 Conservation of Mass

1.6g copper sulfate dissolves in 2.4g water to produce copper sulfate solution. What is the total mass of the solution?

• 3g

• 4g

• 0.8g

2.4g of methanol reacts with 1.5g of oxygen, to produce carbon dioxide and water vapour. What is the total mass of the carbon dioxide and water vapour that is produced?

• 3.9g

• 0.9g

• 0.0g

1.2g iron reacts with oxygen to form 1.8g of iron oxide (rust). What mass of oxygen reacted with the iron?

• 1.8g

• 0.6g

• 3g

Magnesium burns in air to produce 2.5g magnesium oxide. What mass of magnesium reacted if the reaction required 1g oxygen?

• 4.0g

• 1.0g

• 1.5g

• 2.5g

2g citric acid and 2g sodium carbonate react to produce sodium citrate, carbon dioxide and water. How much carbon dioxide is released if the remaining products have a combined mass of 3.2g?

• 4g

• 7.2g

• 1.2g

• 0.8g