Question #1: Copper has a density of 8.92 g/mL. What mass of copper will occupy 45 mL? What volume of copper will have a mass of 1.0 kg (1000g)? Use significant digits.
I got these answers, but am not sure if they're correct:
Part 1: 4.0 X 10^2 g
Part 2: 110 mL
Question #2: The density of quartz was determined by adding a weighted sample to a graduated cylinder containing 56.3 mL of water. After submerging the quartz, the water level was 68.2 mL. The mass of the quartz was 36.5 g. What was the density of the quartz. Use significant digits.
I got this answer, but again I'm not sure if it's correct:
3.07 g/mL
Thanks for any help you can give me!
2007-07-20 14:52:24 · 3 answers · asked by Steven M 3 in Science & Mathematics ➔ Chemistry
I believe you are correct. The first posted answer divided by the density instead of multiplying.
2007-07-20 15:15:16 · answer #1 · answered by anobium625 6 · 1⤊ 0⤋
Q1:
P1: 401.4g = 4.014*10^2g
P2: 112.1076mL = 1.121076*10^-1 L
Q2:
Density is: 3.06723 g/mL
2007-07-21 06:14:22 · answer #2 · answered by MO. NO 1 · 1⤊ 0⤋
45mLCu x 1gCu/8.92mLCu = 5.0 g Cu
1.0kgCu x 1000gCu/1kgCu x 1mLCu/8.92gCu = 112mLCu (110mLCu, two sig figs)
68.2mLH2O - 56.3mLH2O = 11.9mLQ
36.5gQ/11.9mLQ = 3.07g/mL Q
2007-07-20 22:07:06 · answer #3 · answered by steve_geo1 7 · 0⤊ 0⤋