One grain of this sand approximately weighs 6 x 10^-6g. b) How many grains of sand are there in 7200 kg of sand?
Give your answer in standard from.

1.2×10¹² grains

Step-by-step explanation:

1 grain = 6×10⁻⁶ g

7200 kg = 7200000 g = 7.2×10⁶ g = 7.2×10⁶ ÷ 6×10⁻⁶ = (7.2÷6)×10⁶⁻ ⁽⁻⁶⁾ =1.2×10¹² grains

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