Franklin was performing an experiment by combining hydrochloric acid and sodium hydroxide. He measured the mass of his reactant
materials to be 35g. The reaction resulted in the production of salt and water. He reported that his products weighed 32g. Which best describes the results of Franklin’s experiment?
<u><em>B) an error occurred, the mass of the reactants should equal the mass of the products. </em></u>
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Explanation:
The answer choices are:
<em>A) no error occurred, some of the products are always lost as heat.</em>
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<em>B) an error occurred, the mass of the reactants should equal the mass of the products. </em>
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<em>C) an error occurred, the products should weigh more than the reactants. </em>
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<em>D) no error occurred, water is not weighed when determining the weight of the products.</em>
<h2>Solution</h2>
The basis to answer this question is the law of conservation of mass.
Any chemical reaction satisfies the law of conservation of mass: mass cannot be either created nor destroyed, so, always, <em>the mass of the reactants equal the mass of the products.</em>
Thus, since he measured the mass of his reactant materials to be 35g and he reported that his products weighed 32g, his data are in clear contradiction of the law of conservation of mass. So, there is an error in his results: <em>the mass of the reactants should equal the mass of the products. </em>
It varies with container, temperature, pressure and amount of gas. But, the volume occupied by a gas at a fixed temperature and pressure remains constant which is 22.4 L for 1 mole at STP.
Density is mass over volume. If you put it into a formula it would look like this:
Based on the problem given, you can see that the mass of the aluminum block is 82.0 g and the volume is 12.8 cm3. Just put that into your equation and solve for it:
