Q. 2.115 - An Introduction to General, Organic, and Biological Chemistry

Question

A balance measures mass to $0.001 \mathrm{g}$. If you determine the mass of an object that weighs about $31 \mathrm{g}$, would you record the mass as $31 g, 31.1 g, 31.0 S g, 31.075 g, or 31.0750$ ? Explain your choice by writing two to three complete sentences that describe your thinking. (2.3)

Step-by-Step Solution

Answer

The record mass of an object is determined as $31.075 g$

Step 1 : Given Information

The given is the mass measured by a balance.

The objective is to explain the choice and describe the thinking.

The recorded information are : $531\mathrm{g},31.1\mathrm{g},31.0\mathrm{s}g,31.075\mathrm{g},\text{ or }31.0750$

Step 2 : Explanation

After the decimal point, the balance measures mass up to three digits. 

As a result, after the decimal point, you would record the mass up to three digits. 

As a result, the record mass of an object from balance is $31.075 g$