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12 February, 15:48

A scientist conducts a chemical reaction. At the beginning of the reaction, she combines 5.4 grams of the first reactant and 6.3 grams of the second reactant. She runs the reaction in a closed chamber and heats only the reaction. A small amount of gas is produced. What can you conclude about the total mass of the substances present when the reaction is complete?

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  1. 12 February, 18:00
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    The total of the mass of the substances present should be approximately equal to the sum of the mass of the reactants or 11.7 g assuming that the mas of the gas produced is negligible or very small. This is to agree the law of conservation of mass where mass cannot be created nor destroyed.
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