AP Chemistry Help!?

Question

Please Help:

A 0.250 M solution of AgNO3 is to be prepared. What mass of AGNO3 do you need in order to prepare 50.0 ML of this solution?

a)2.12g AGNO3
b)4.98g AGNO3
c)6.66g AGNO3
d)9.87g AGNO3
e)12.5g AGNO3

Answer 1

If you are in AP Chem and can't get this one, the best help I can suggest is give up AP chem. Are you just starting out?

You are makeing a .25 Moles / liter solution, you want to make .05000 L of solution (.25 x .05), you need 0.01250 moles of AgNO3.

molar mass of AgNO3 is 169.88 g / mole. (0.0125 x 84.99) the mass you need is 2.12 g of AgNo3. Answer is A.