Finding molar mass, number of ions, and moles of compounds

[chawki]

Homework Statement

a) What is the mass of one mole of Ca(NO₃)₂?
b) How many Ca²⁺ ions are there in 0.05 moles of Ca(NO₃)₂?
c) How many moles ofNaCl are there in 450 g of this substance?
(Avogadro’s number is 6.022*10²³ 1/mol.)

Homework Equations

The Attempt at a Solution

a)
m=n*M=1*164.1
m=164.1g
b)
I have NO IDEA, help me
c)
n=450/75.53
n=5.95mol

 

[symbolipoint]

You see the mole ratio directly in the molecular formula. Now instead of having 1 mole of Ca(NO₃)₂, you have only 0.05 moles. So how many of Ca⁺²?

 

[chawki]

0.05*6.022*E23?
first and last question are true ?