# Sodium-24 has ahalf-life of about 15 hours how much of an 1.60 gram sample of sodium-24 will remain after 60.0 hours? Ans :(1g)?

##### 2 Answers

#### Explanation:

As we start with 1.6 grams and we know that 60 hours have passed, this equals 4 half-lives. This means that the weight of the sample has effectively been halved 4 times:

So simply multiply this with the mass:

Generally:

Remaining mass

Where

There seems to be a mistake in your given answer.

The correct answer is

#### Explanation:

A formula for half-life decay is:

Where

We are given that