Answer:
5 significant figures: 670.90 in.
4 significant figures: 8.314 J/mol-K, 6.022x10 23 mol-1, 0.6258 mg, 2.205 lb and 3270 ft.
3 significant figures: 40.7 g.
2 significant figures: 12 mL, 1.2 years, 7.0 m2, 50, cm and 90 m.
1 significant figure: 0,005 L.
Explanation:
Hello,
In this case, we proceed as follows:
* 8.314 J/mol-K has 4 significant figures since 8, 3, 1 and 4 are significant (nonzero).
* 6.022x10 23 mol-1 has 4 significant figures since 6, 0, 2 and 2 are significant including the zero as it is at the right of the first nonzero digit (6).
* 12 mL has 2 significant figures since 1 and 2 are significant (nonzero).
* 1.2 years has 2 significant figures since 1 and 2 are significant (nonzero).
* 7.0 m2 has 2 significant figures since 1 and 2 are significant (nonzero).
* 50, cm has 2 significant figures since 1 and 2 are significant (nonzero).
* 0,005 L has 1 significant figure since 5 is the only nonzero digit.
* 40.7 g has 3 significant figures since 4, 0 and 7 are significant including the zero as it is at the right of the first nonzero digit (4).
* 670.90 in has 5 significant figures since 6, 7, 0, 9 and 0 are significant including the zeros as they are at the right of the first nonzero digit (6).
* 0.6258 mg has 4 significant figures since the first zero is at the left of the first nonzero digit, therefore, it is not included.
* 2.205 lb has 4 significant figures since 2, 2, 0 and 5 are significant including the zero as it is at the right of the first nonzero digit (2).
* 3270 ft has 4 significant figures since 3, 2, 7 and 0 are significant including the zero as it is at the right of the first nonzero digit (3).
* 90 m has 2 significant figures since 1 and 2 are significant (nonzero).
Regards.
