Keeping in mind the rules for significant dig- its, what is the product of 0.6906 m and 4.03
m?

2.78

Explanation:

When multiplying, your answer will have the same amount of sig figs as the multicand or multiplier that has the lower number of sig figs. In this case, 4.03 is the one with the lowest number of sigs figs, which is 3 sig figs, so the answer should have 3 sig figs, so the answer is 2.78.

c is the answer because when something is left after something evaporates that shows the chemical change.