What is the molarity of 147 grams of H2SO4 (MW = 98)? Cannot remember how to do this.

Your question doesn't make much sense, molarity is concentration; you didn't tell us how much water it is mixed with. If you want how many moles, it's a different story.

Molarity = moles per liter.

Molar Mass = all the atomic weights added up in grams.

H_{2}SO_{4}

H = 1
O = 16
S = 32

(1 x 2) + 32 + (16 x 4) = 98

(I see you got that far)

\frac{147}{98} = 1.5 moles

If that were mixed with 1 liter of water, that would get you a 1.5 molar solution. If it were mixed with half of a liter (500mL) it would present you with a 3 molar solution...

I hope this helps.

Thank you.