The correct option is (D) 193 g.
Explanation:
Loss of weight in water = Weight in air − Weight in water
= 210−198
= 12 grams
Volume of the crown in cm3 = Loss of weight in grams =12 cm3
Expression for RD:
RD = Weight in air/Loss of weight
Let,
mass of gold = x
Hence,
Loss of weight of gold + Loss of weight of copper = 12 grams
x/19.3 + 210−x/8.5 =12
8.5 x − 19.3 x + 4053 = 1968.6
10.8 x = 2084.4
x = 193 grams