It is: 4.21*10-4 g
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It is 4.21*10^2 g in scientific notation
0.000421g in Scientific Notation = 4.21 x 10-4 g
0.0015 grams = 0.0000015 kilograms = 1.5-6 kilograms.
Scientific notation is a way of representing numbers: it does not have any mass and so there are 0 lots of 0.8g in scientific notation.
100.0 G + 0.01 G = 100.01 G Expressed in scientific notation: 1.0001*103 G