Question 1

Paper 1Medium6 marks

A laboratory sample contains 3.6×10133.6 \times 10^{13} identical nanoparticles. Each nanoparticle has a mass of 4.7×10−194.7 \times 10^{-19} kg.

(a)

Calculate the total mass of the nanoparticles in the sample, in kg. Give your answer in scientific notation.

[2]
(b)

A filter removes nanoparticles with a combined mass of 5.64×10−65.64 \times 10^{-6} kg. Using your answer to part (a), determine the number of nanoparticles remaining. Give your answer in scientific notation.

[4]

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