The relative atomic mass is the weighted average mass of elements relative to 1/12th the mass of a 12-C atom.

Isotopes are atoms of the same element with different masses , in other words different numbers of neutrons.

Relative atomic mass =sum of (mass x percentage )

R.a.m = 62.9300 x 69.15% + 64.9200 x 30.85%

= 43.52 + 20.03

= 63.55 amu

**Answer:**

I believe they deserve to be here.

**Explanation:**

I think the correct answer is decrease in temperature

I feel like that’s the right one

The scale will read **<u>112 grams.</u>**

**Why?**

Since we already know the** percent error** of the scale (12%) and we also know the mass of the block that is placed on the scale, we can calculate what will be the read of the scale by using the following formula:

We can see that the scale will read **112 grams**.

Let's verify that we are right by using the following formula to verify if the obtained value for the scale read will be 12%:

Hence, we can see that the scale will read **<u>112 grams.</u>**

Have a nice day!