At standard pressure, 15.0 grams of a compound at it boiling point is completely vaporized by 4 900 calories of heat. What is the heat of
vaporization of this compound?
1. 330 cal/g
2. 74 000 cal/g
3. 80. cal/g
4. 3.1 cal/g

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

the answer is 0.42 is that is an option. this question provides no info