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# How many sig figs for this question: now determine the grams per litre (g/L) concentration of acetic acid in the undiluted vinegar (assume the molar mass of acetic acid is 60.0 g/mol)? I don't want the answer I'm asking for how many sig figs ?

If you only go by **60.0 g**, the answer will need **3** .

When you're dealing with a **decimal number**, try to remember that

- Non-zero digits and zeros that come after them before the decimal are significant;

In your case, you have **6** and **0** before the decimal, so that's two sig figs right off the bat. By comparison, **060.0** would still have 2 sig figs **before the decimal**, because the first zero does not count.

- If you have non-zero digits
**before**the decimal,**all digits**after the decimal are significant;

You only have **1** digit after the decimal, a zero, but because you had a **6** before the decimal, it counts as a sig fig as well.

- If you only have zeros
**before**the decimal, only non-zero digits and zeros that come after them are considered significant**after**the decimal.

For example, **0.02** only has 1 sig fig, because you only have zeros before the decimal, so only the **2** after the decimal counts.

At the same time, **0.020** has 2 sig figs, because you have a non-zero digit followed by a zero digit in the decimal portion.

As a conclusion, your answer must have **3** because **60.0** has 3 sig figs.