Respuesta :

syed514

M = Au + Ag + Cu

Au = 75 *.28/16
Ag = 9*.28/16
Cu = 0.28

Add them all and you will get the answer.

Answer:

The  mass of necklace is 1.75 gm.

Explanation:

Given that

The total mass of necklace will be the some of the mass of silver,mass of the  gold and mass of the copper.

Mass of gold = 18 %

Mass silver = 16%

Mass copper = 9%

Lets take the mass of necklace is m

Then mass of silver will 0.16 m.

And given that mass of silver is 0.28 gm.

So

0.28 gm = 0.16 x m

m= 1.75 gm

So the  mass of necklace is 1.75 gm.

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