Chemistry is strict about Significant Figures. If you calculate 43.47 grams, but your given data (15.0 grams) has only three sig figs, your final answer must be rounded to . If you write 43.47, the answer is technically wrong. Always check the sig figs last.
Significant Figures: Round your final answer based on the least precise measurement given in the prompt. Chemistry 11-3 Practice Problems Answers
(Note: Many students get the answer wrong here by putting the grams on top and moles on the bottom. Always arrange the fraction so the unit you want to cancel is on the bottom.) Chemistry is strict about Significant Figures
| Problem # | Question Type | Correct Answer | |-----------|---------------|----------------| | 1 | Combined gas law (find ( V_2 )) | 2.40 L | | 2 | Dalton’s law over water | 95.36 kPa | | 3 | Charles’s law (constant P) | 6.25 L | | 4 | Partial pressures mixture | 1.34 atm | | 5 | Two-stage combined gas law | 400. mL | | 6 | Find ( P_2 ) | 1.50 atm | | 7 | Gas collected over water – moles | 0.0097 mol | | 8 | Temperature from volume change | 546 K | Always check the sig figs last