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I'm confused as to what unit I should be using for mass. During the lecture, Lavelle stated that the SI unit of mass was "kilogram", but a majority of the answers to homework problems come out in terms of "grams". Can someone explain?
The SI unit for mass, as explained by Lavelle, is kilograms due to the units of Joules which is (kg x m^2 x s^-2). However, usually when doing problems we convert to the base unit which is grams unless an equation states otherwise.
Yes, the SI unit for mass is kg. However, in many problems, we're dealing with amounts of samples that make most sense to express in g. In a realistic lab setting we would say 2.4 g instead of 2.4 x 10^-3 kg. So if a problem gives units in g, it's probably best to use g in your answer
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