I'm having a problem with a simple conversion question!

"What is the molarity of 30.0 g of NH3 in 70.0 g of water? The desnity of the solution is 0.982 g/mL, and the molecular weight of ammonia is 17.0 g/mol"

1.76 mol NH3

Vsolution = mass/density
V= 70.0g/982 g/L = 71.28 L

M = 1.76/71.28 = 0.0246

the answer key says its 17.3 but i keep getting it wrong. where am i messing up in my conversions?!

30 g NH3 is in 100 g soln, not 70.