Question

Sterling silver contains 92.5% silver and 7.5% copper. A sterling silver dish weighs 185.0 g. What mass of copper is in the dish?

Answer 1

Answer:

I believe the answer is 14g

Answer 2

Answer: The mass of copper in the dish is 13.875 grams.

Explanation:

We are given:

(m/m) % of copper = 7.5 %

This means that 7.5 grams of copper are present in 100 grams of solution.

We need to find the mass of copper in 185 grams of sterling silver dish.

To calculate the mass of copper, we use unitary method, we get:

In 100 g of sterling silver dish, the mass of copper is 7.5 grams.

So, in 185 grams of sterling silver dish, the mass of copper is = $\frac{7.5g}{100g}\times 185g=13.875g$

Hence, the mass of copper in the dish is 13.875 grams.