1000000 mcg = 1 gram and you do not use scientific notation for 1. But, if you must, it is 1*10^0
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There are one million micrograms in one gram.
There are 1,000,000 micrograms in each gram. Here you have to multiply by a million. 0.00471*1000000 is 4,791 micrograms.
Write 10 Gaga grams in scientific notation and convert the answer into imperial unites
It is 5*10^-3 grams.
The difference between milli and micro is an order of magnitude -- a factor of 1000. In other words, one milligram equals 1000 micrograms. Hence, 0.25 mg -- that is, a quarter of a milligram -- is equal to 250 micrograms.