10 significant figures.
3 significants
Six of them.
48.921 has five significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
one
.020 has two significant figures: 2 and 0 A significant figure are digits that contain meaning contributing to precision. All numbers are considered meaningful except for zero, unless zero is between two other numbers or tailing non zero numbers where a decimal is present.
3 significants
3 significant figures. The two ones, and the zero between them.
Six of them.
Using eight significant figures, there are 6.0221421 X 10^23 carbon atoms present in a mole of 12c.
48.921 has five significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
There are six sig figs in 1356.30.
one
3 if there is a decimal present you start counting from the left with the first nonzero number and continue until there are no numbers left
At most 1.
6.0221421 x 10^23
.020 has two significant figures: 2 and 0 A significant figure are digits that contain meaning contributing to precision. All numbers are considered meaningful except for zero, unless zero is between two other numbers or tailing non zero numbers where a decimal is present.
Yes. That's a step you should usually include, to avoid the result from looking more accurate than it actually is.