Answer
The new and old values for Avogadro's number are the same up to 7 significant digits; both are equal
to 6.022141 x 10^23, but differ in the next digit. The uncertainty only has 2 significant digits (1.5 ×10^17). If the uncertainty were subtracted from 6.0221415 x 10^23, the result would be 6.0221414 x
10^23, so with the uncertainty, the two numbers are the same to 7 significant digits (6.0221415 x 10^23
and 602,214,141,070,409,084,099,072
Work Step by Step
The new and old values for Avogadro's number are the same up to 7 significant digits; both are equal
to 6.022141 x 10^23, but differ in the next digit. The uncertainty only has 2 significant digits (1.5 ×10^17). If the uncertainty were subtracted from 6.0221415 x 10^23, the result would be 6.0221414 x
10^23, so with the uncertainty, the two numbers are the same to 7 significant digits (6.0221415 x 10^23
and 602,214,141,070,409,084,099,072
