Q135 of 196 Page 249

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

Given mass of electron = 9.1093826 × 10-31 kilograms


We know that 1 kilogram = 1000 grams = 103 grams.


⇒ Mass of electron = 9.1093826 × 10-31 × 103


We know that by properties of exponents, am × an = am + n.


⇒ 9.1093826 × 10-31 × 103 = 9.1093826 × 10-31 + 3


= 9.1093826 × 10-28


∴ Mass of electron in grams = 9.1093826 × 10-28 grams


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