Three - all nonzero digits are significant.
3 of them.
2 of them.
it would be 0.03 just round up, two significant figures means two figures after the decimal point. If it was 3 significant figures then it would be 0.04 etc....
0.277 mole Na2CO3 x 106 g/mole = 29.4 g (to 3 significant figures)
Molar mass NO2 = 46.0 g/mole1.18 g NO2 x 1 mol NO2/46.0 g = 0.0257 moles NO2 (to 3 significant figures)
10.4 g NaF x 1 mol NaF/42 g x 1 mol F/mol NaF = 0.248 moles F- ions (3 significant figures).
There are 2 significant figures in this measurement.
2 significant figures.
2 significant figures.
2 of them.
5
6 of them.
5 of them.
Three.
There are two significant figures.
4 of them.
there are 5 significant figures
2 of them.