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5 significant figures.
Rounded to two significant figures, 7.42 grams is approximately equal to 7.4 grams.
4 of them.
5
302.05 grams
There are 3 significant figures in '4.50g'
The 3 and the 2.
to .0251 grams or 2.51 x 10-2 grams
Three of them.
302.5 grams
There are 4 significant figures in this problem.
4