# What is the mass of #3.2 × 10^24# atoms of nickel?

##### 1 Answer

The mass is 310 g.

#### Explanation:

You have to round this answer to 2 significant figures.

That is, you must drop all digits to the right of the red bar:

When rounding, you examine the digit to the right of the red bar: the

The digit you are examining is the **first digit to be dropped**.

If the first digit to be dropped is less than 5, drop it and all the digits to the right of it.

The rounded number becomes

Note: The trailing zero in