# Chemistry Question?

You heat a salt that has Mg as the cation and SO4 as the anion.

The salt loses about half its mass while heating, but you know you still have the

same number of Mg, S, and O atoms present. What is a reasonable explanation?

a. The Mg underwent a nuclear reaction and lost protons

b. Electrons were lost

c. The ionic compound was hygroscopic and held water molecules in its crystal lattice

d. Some of the SO4 converted to SO3

e. none of these are possible explanations

Is the formula C5H12O enough information to tell you exactly what compound you are dealing with

a. Yes, if it is the empirical formula

b. Yes, it tells us that the oxygen is bonded to one of the hydrogens

c. Yes, we know the ratios of the numbers of atoms

d. No, there are multiple constitutional isomers that have this same formula

If a solution is 2.5% ethyl alcohol by mass, how many ppm (parts per million) of alcohol are in the solution?

a. 2.5

b. 25

c. 250

d. 2500

### 2 Answers

- Anonymous9 months ago
First one, you can eliminate a and b, you should have been able to do that. If you google MgSO4 you will find it's hygroscopic so c is correct.

No, d

Last one, to convert mass % to ppm, convert to mass fraction (divide by 100) and multiply then by 1,000,000. Or combine the two and multiply by 10,000. None of the answers are correct, the correct one is 25,000.