Well, honey, the number of significant figures in 0.00320 g is four. Those zeros between the 3 and the 2 might look useless, but in this case, they're strutting their stuff and making the measurement more precise. So, don't go underestimating those zeros, darling.
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there are 5 significant figures
0.320g has three significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
Two significant figures the measurment 0.0255 g should be reported as 0.026g
2 significant figures.
5 of them.