Answer:
7.) 126.7 cm³
8.) 789 g
Step-by-step explanation:
7.) To find the volume (cm³) of alcohol, you need to multiply the given mass (g) by the density. The denisty ratio represents grams of the alcohol per every 1 cm³. It is important to arrange the ratio in a way that allows for the cancellation of units (grams should be in the denominator). The final answer should have 4 sig figs to match the given value with the least amount of sig figs (100.0 grams).
100.0 grams 1 cm³
--------------------- x --------------------------- = 126.7 cm³
0.78945 grams
8.) This time, you are given the volume instead of the mass. The same process can be used in this problem, but you first need to convert liters (L) to cm³ to be able to use the denisty ratio. Once you find the volume in cm³, you can multiply it by the density to find the mass. Again, be sure to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the given value with the least amount of sig figs (1.00 L).
1 L = 1,000 cm³
1.00 L 1,000 cm³ 0.78945 g
------------- x ------------------- x -------------------- = 789 g
1 L 1 cm³