How come the mass of H20 is 2.25x10^7 , like if there are only 2 zeros why is it to the power of 7?

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It's 2.25x10^7 grams or 2.25x10^4 kilograms. The metric system goes by powers of ten. She points out at 4:40 that the units for specific heat are J/g Celsius. One needs to keep the units the same.