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 × 10–3 g.
b. The mass of one molecule of water is 1.80 × 10–10 g.
c. There are 3.01 × 1023 atoms of Na in 0.500 mol of Na.
d. The molar mass of CO2 is 44.0 kg/mol.