Question

A sample of brass contains 71.2 g copper, 28.7 g zinc, and 1.03 g tin. Calculate the percentage of each component present in the brass sample.

a) 61.2% copper, 28.7% zinc, 1.03% tin

b) 44.5% copper, 50.8% zinc, 4.7% tin

c) 54.5% copper, 45.2% zinc, 0.3% tin

d) 70.1% copper, 29.9% zinc, 0.85% tin

Answer 1

To calculate the percentage of each component in the brass sample, divide the mass of each component by the total mass of the sample and multiply by 100. The correct answer is a) 61.2% copper, 28.7% zinc, 1.03% tin.

Step-by-step explanation:

To calculate the percentage of each component present in the brass sample, we need to determine the mass of each component and the total mass of the sample.

Given that the sample contains 71.2 g copper, 28.7 g zinc, and 1.03 g tin, the total mass of the sample is (71.2 g + 28.7 g + 1.03 g) = 101.93 g.

The percentage of each component can be calculated by dividing the mass of each component by the total mass of the sample and multiplying by 100.

The percentage of copper is (71.2 g / 101.93 g) * 100 = 69.8%, the percentage of zinc is (28.7 g / 101.93 g) * 100 = 28.2%, and the percentage of tin is (1.03 g / 101.93 g) * 100 = 1.0%.

Therefore, the correct answer is a) 61.2% copper, 28.7% zinc, 1.03% tin.