Question

To seven significant figures, the mass of a proton is 1.672623 x10^{-27} kg. Which of the following choices demonstrates correct rounding?

Answer 1

Answer:

$1.67\times 10^{-27}kg$

Explanation:

We are given that mass of proton

$1.672623\times 10^{-27}kg$

There are seven significant figures.

We have to round off.

If we round off to three  significant figures

The  thousandth place  of given mass of proton  is less than five therefore, digits on left side of  thousandth  place remains same and digits on right side of thousandth place and thousandth  replace by zero

Therefore, the mass of proton can be written as

$1.67\times 10^{-27}kg$

Hence, the mass of proton is $1.67\times 10^{-27}kg$