A critical point to master in becoming proficient at solving problems is evaluating whether or not your answer is reasonable. A friend asks you to look over her homework to see if she has done the calculations correctly. Shown below are descriptions of some of her answers. Without using your calculator or doing calculations on paper, see if you can judge the answers below as being reasonable or ones that will require her to go back and work the problems again. a. 0.33 mol of an element has a mass of 1.0 \times 10^{-3} \mathrm{~g}. b. The mass of one molecule of water is 1.80 \times 10^{-10} \mathrm{~g}. c. There are 3.01 \times 10^{23} atoms of Na in 0.500 \mathrm{~mol} of \mathrm{Na}. d. The molar mass of \mathrm{CO}_{2} is 44.0 \mathrm{~kg} / \mathrm{mol}.
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