# 1 tonne of CuSO4 contains how many kg of copper? (Mr; Cu=63.5, S=32, O=16)

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Options

a) 63.5/159.5 * 1000 b) 63.5/96 * 1000 c) 63.5/159.5 * 1 d) 63.5/159.5 * 1/1000

Options

a) 63.5/159.5 * 1000 b) 63.5/96 * 1000 c) 63.5/159.5 * 1 d) 63.5/159.5 * 1/1000

##### 1 Answer

a)

#### Explanation:

Let's look at the formula of copper(II) sulfate.#.

The formula tells you that there are 63.5 units of copper in 159.5 units of

The units can be anything you want.

We usually use grams, but they could be micrograms, kilograms, tonnes, pounds, etc.

Thus, in 1 t of

Thus the numbers in the calculation are

This question is an excellent example of why you should **always use units in your calculations**.

If the units don't cancel correctly, you know you have done something wrong.