Answer :
(a) There are 3 significant figures.
(b) There are 1 significant figures.
(c) There are 7 significant figures.
(d) There are 6 significant figures.
(e) There are 3 significant figures.
(f) There are 3 significant figures.
(g) There are 4 significant figures.
Explanation :
Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.
Rules for significant figures:
- Digits from 1 to 9 are always significant and have infinite number of significant figures.
- All non-zero numbers are always significant. For example: 654, 6.54 and 65.4 all have three significant figures.
- All zero’s between integers are always significant. For example: 5005, 5.005 and 50.05 all have four significant figures.
- All zero’s preceding the first integers are never significant. For example: 0.0078 has two significant figures.
- All zero’s after the decimal point are always significant. For example: 4.500, 45.00 and 450.0 all have four significant figures.
- All zeroes used solely for spacing the decimal point are not significant. For example : 8000 has one significant figure.
- The exponential digits present in scientific notation are not significant, only decimal digits the significant. For example:
has 2 significant figures (1 and 9).
(a) 38.7 g
According to the 2nd rule, there are 3 significant figures.
(b)
According to the 7th rule, there are 1 significant figures.
(c) 3,486,002 kg
According to the 2nd rule, there are 7 significant figures.
(d)
According to the 7th rule, there are 6 significant figures.
(e)
According to the 4th rule, there are 3 significant figures.
(f) 17.0 kg
According to the 5th rule, there are 3 significant figures.
(g) 0.01400 g/ml
According to the 4th rule, there are 4 significant figures.