Question

How many moles of H2O have a mass of 32.6 grams?

A. 1.81 × 100 moles

B. 5.06 × 100 moles

C. 1.80 × 101 moles

D. 2.24 × 101 moles

E. 3.26 × 101 moles

Answer 1

What's the mass of 1 mole H2O?

Answer 2

H=1.00794 g/mol
O=15.9994 g/mol

Answer 3

So 1 mole H2O = 18.01528 grams
Now you have to find out how many moles equal 32.6 grams

Answer 4

1.81 x 10^0 moles.

32.6/18 (molar mass of water) = 1.81

Answer 5

An easy trick is a crosstable.

You say: 1mol = 18.01528 g
nou need ?mol = 32.6 g

So you multiply 32.6 by 1 and then divide that by 18.01528
Then your answer would be 1.81 moles

Answer 6

Yes so your answer is C :D

Answer 7

C or A?

Answer 8

onooo A i mean xDDDD

Answer 9

srry

Answer 10

misread it :P

Answer 11

No problem! Thanks a lot :)