Question

A certain ore is 20.7% nickel by mass. How many kilograms of this ore would you need to dig up to have 70.0 g of nickel?

Answer 1

Answer:

0.3382 kg

Explanation:

From the illustration:

100g of the ore would contain 20.7 g of nickel by mass. In order to obtain 70.0 g of nickel, the amount of the ore needed would be:

          100 x 70.0/20.7 = 338.16 g

According to conversion units:

1 g = 0.001 kg

Hence,

338.16 g = 338.16 x 0.001 = 0.3382 kg

Therefore, 0.3382 kg of the ore would be required in order to obtain 70.0 g of nickel.