Basis exercise

  • Thread starter chawki
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  • #1
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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
 

Answers and Replies

  • #2
symbolipoint
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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?
 
  • #3
510
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0.05*6.022*E23?
first and last question are true ?
 

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