alloy 0.00740 mol Ni 0.0886 mol Cu mass percent

alloy 0.00740 mol Ni 0.0886 mol Cu mass percent

 

 

Each quarter produced by the U.S. mint

is made up of copper and nickel alloy.

In each coin there is 0.00740 moles of Ni

and 0.0886 moles of copper.

(a) What is the total mass of a quarter?

(b) What percentage of the mass of a quarter

is nickel and what percentage is copper?

 

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Ni의 몰질량 = 58.69 g/mol 이므로,

0.00740 mol × (58.69 g/mol) = 0.4343 g Ni

( 참고 https://ywpop.tistory.com/7738 )

 

Cu의 몰질량 = 63.55 g/mol 이므로,

0.0886 × 63.55 = 5.6305 g Cu

 

 

 

total mass = 0.4343 + 5.6305 = 6.0648 g

 

 

 

%Ni = (0.4343 / 6.0648) × 100 = 7.16%

 

%Cu = (5.6305 / 6.0648) × 100 = 92.84%

 

 

 

 

[키워드] alloy 0.00740 mol Ni 0.886 mol Cu mass percent