laws of indices problem
2012-03-02 7:51 pm
The mass of a hydrogen atom is 1.673 x 10^-24g and that of an oxygen atom is 2.656 x 10^-23g By how much does 2 oxygen atoms weigh more than 1 hydrogen atom? ROUND OFF YOUR ANSWER CORRECT TO 3 SIGNIFICANT FIGURES, AND EXPRESS IT IN SCIENTIFIC NOTATION.
回答 (1)
2012-03-02 8:03 pm
✔ 最佳答案
The required difference in mass= 2 x (2.656 x 10^-23) - (1.673 x 10^-24) g
= (5.312 x 10^-23) - (0.1673 x 10^-23) g
= 5.1447 x 10^-23 g
= 5.14 x 10^-23 g (3 sig. fig.)
參考: fooks
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