The rate of evaporation will increase as well.
As per the rule, oxidation number of alkaline earth metals in their compounds is +2. Oxidation number of oxygen in it's compounds is -2(except peroxides) and the sum of oxidation numbers of all the elements of a neutral compound is zero.
The answer is C. 146g because you add all of the masses of the individual elements and then mulyiply by 1.72 to get your answer.