How many significant figures does 22.0, 0.22, 22. , 0.022?

Im just confused as to the decimal addition to numbers and what the sig figs will be for them.

If you don't mind can you please state some rules for sig figs that are helpful and some confusing rules as well and pretty please with a cherrry on top, some examples???? Im a chemistry Student by the way.

THNAK YOU!!!!!!! ;^)

Here is a good site?

http://www.chemteam.info/SigFigs/SigFigs.html

Zeros before the number don't count. zeros after the decimal point count. Zeros between two numbers count.
0.22 has two.
220.0 has four.
202 has three.

22.0 has three

0.22 has two
22 has two
0.022 has two
0.00000000223 has three

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Sure! Understanding significant figures (sig figs) is important in chemistry as they indicate the precision of a measurement or calculation. Here are some rules for determining significant figures:

1. Non-zero digits are always significant. For example, in the number 22.0, all three digits (2, 2, and 0) are significant.

2. Zeros between non-zero digits are significant. For example, in the number 0.022, both zeros are significant.

3. Leading zeros (zeros before the first non-zero digit) are not significant. For example, in the number 0.022, the leading zero is not significant.

4. Trailing zeros (zeros after the last non-zero digit and after the decimal point) are significant if they are explicitly written. For example, in the number 22.0, the trailing zero is significant.

Now, let's apply these rules to determine the number of significant figures in the given numbers:

1. 22.0: There are three significant figures (2, 2, and 0).

2. 0.22: There are two significant figures (2 and 2).

3. 22.: There are two significant figures (2 and 2). The trailing zero after the decimal point makes it significant.

4. 0.022: There are three significant figures (0, 0, and 2). The leading zero is not significant, but the other two zeros are.

Now, let's look at some additional rules and examples:

5. When adding or subtracting numbers, the result should be rounded to the least precise decimal place. For example, if you add 3.15 and 2.1, the sum should be rounded to 3.2 since the least precise decimal place is in the tenths.

6. When multiplying or dividing numbers, the result should be rounded to the same number of significant figures as the least precise number in the calculation. For example, if you multiply 3.15 and 2.1, the result should be rounded to 6.6 since the number 2.1 has the fewest significant figures (2).

Remember, significant figures help convey the precision of a measurement or calculation. It is essential to use them correctly in scientific calculations.

22.0 has 2 significant figures