A crown made of gold and silver has a volume of 60mL and a mass of 2.10kg. Find the mass of gold contained in the crown
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Explanation:
To determine : The weight of gold in crown
Given : Weight of crown in air 210 g
Weight of crown in water = 198 g
Specific gravity /density of gold = 19.3 g/cc
Specific gravity /density of copper = 8.5 g /cc
Formula : Density=mass/volume
Calculation:
Loss of weight = 210 - 198 = 12 g
Therefore
Weight of the crown = volume of gold x density of gold + volume of copper × density of copper
mass of gold in crown+mass of copper in crown = 210---(1)
(mass ofgold)/19.3 + (mass of copper)/8.5 = 12---(2)
Solving both the equations (1) and (2)
We get
Weight of gold in crown is 193g .
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