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Q.

An electron’s mass is approximately 9.1093826× 10 −31  kilograms. What is this mass in grams?


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a

9.1093826× 10 −24  gm

b

9.1093826× 10 28  gm

c

9.1093826× 10 −26  gm

d

9.1093826× 10 24  gm 

answer is B.

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Detailed Solution

It is given an electron’s mass is approximately 9.1093826× 10 −31  kilograms.
1kg =1000gm
Using the exponent law,  a m × a n = a m+n  .
Representing in grams the mass of electron (Since, 1kg =1000gm)
Mass of electron is;
= 9.1093826× 10 −31 ×1000gm  
=9.1093826× 10 −31 × 10 3   gm…………. (1)
 Use in equation (1)  Question Image =9.1093826× 10 −31+3   gm
 = 9.1093826× 10 −28  gm
 Hence, the mass of electron is 9.1093826× 10 −28  gm.
Hence option (2) is correct.
 
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