An electron has a mass of 9.109 x 10 -31 . Whatis the mass (in kilograms) of 2.5

Question

An electron has a mass of 9.109 x 10-31. Whatis the mass (in kilograms) of 2.500 billion electrons? I multiplied 2.500 (9.109 x 10-31) = 2.277 x10-30 was my answer, but according to the book the realanswer is 2.77 x 10-21. How did they come to thisconclusion, and where did I go wrong? Thank you. Sincerely, Jeannette An electron has a mass of 9.109 x 10-31. Whatis the mass (in kilograms) of 2.500 billion electrons? I multiplied 2.500 (9.109 x 10-31) = 2.277 x10-30 was my answer, but according to the book the realanswer is 2.77 x 10-21. How did they come to thisconclusion, and where did I go wrong? Thank you. Sincerely, Jeannette

Explanation / Answer

Take mass of each electron multiply by 2.5 billion. Notice thatit's billion which is 109. (9.109 x 10-31)(2.5 x 109) = 2.77 x10-21 kg

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