Question

Calculate the number of moles required to make 100 mL of a 3.0 M solution of CuSO4·5 H2O.
is the answer .03? if not walk me through the steps thanks

Answer 1

Recall that molarity is moles of solute per liter of solution. It has mol/L (or M) units.
M = n/V

First, we convert the volume (100 mL) to liters units. To convert, we just divide it by 1000:
100 / 1000 = 0.1 L
Since we need to calculate the moles, we rearrange the formula to get n:
n = M*V
Substituting,
n = 3.0 M * 0.1 L
n = 0.3 mol CuSO4·5H2O

hope this helps~ `u`

Answer 2

Note: 1L = 1000mL, so 100mL = 0.1L

Use proportions:
3 mol are required to make 1 L of 3.0M solution.
x mol are required to make 0.1 L of 3.0M solution.
x=3 mol * 0.1L /(1L)
=0.3 mol