Question

Which of the following compounds has a molar mass of 2.8 × 101 grams?

A. H2O

B. SO2

C. CO

D. NO2

E. CH4

Answer 1

is A the correct answer?

Answer 2

Hydrogen has a molar mass of 1.008 g/mol
Oxygen has a molar mass of 15.999 g/mol

15.999+2(1.008) = 18.015 g/mol
So A is not the answer

Go to http://ptable.com, check how many atoms of an element you have (eg. for H2O that's 2x H and 1x O. Find the molar mass of these individual elements and add up.

Answer 3

The molar mass of sulfur is 32.06 so that's already too much, so it's not B either

Answer 4

I think it is carbon monoxide!!!

Answer 5

C = 12.011
O = 15.999

12.011+15.999 = 28.01
So that's the answer :)

Answer 6

thanks :)