How many carbon atoms are found in 0.429 grams of the amino acid glycine, H2NCH2COOH? Enter your answer in scientific no

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How many carbon atoms are found in 0.429 grams of the amino acid
glycine, H2NCH2COOH? Enter your answer in
scientific notation, to three significant figures.
How many atoms are there in 7.39 moles of calcium
(Ca)? Enter you answer to the appropriate number of
significant figures. You'll probably want to use scientific
notation for this one. Learn requires scientific notation be
entered in the following format: 1.23e4. For example:
5.34 × 108 would be entered as 5.34e8,
and
5.34 × 10-8 would be entered as 5.38e-8
The adult human body contains between 4.00 and
8.00 grams of iron (Fe) atoms, depending on
size. Determine the number of Fe atoms in 4.63 grams of Fe. Enter
your answer in scientific notation, to the correct number of
significant figures.