A piece of aluminum metal weighs 32.4 g in air and is placed in liquid mercury. What volume of the aluminum will be below the surface of the mercury? Density of aluminum = 2.70 g/mL
Density of mercury is 13.5 g/mL
u have to use sig. figs in all parts
how do u solve it?
2006-09-14 17:45:37 · 7 answers · asked by questioner 2 in Science & Mathematics ➔ Chemistry
The aluminum will sink into the mercury until the weight of the mercury displaced by the aluminum equals the weight of the aluminum, which is 32.4 grams.
What volume of mercury weighs 32.4 grams?
Density = weight / volume, or volume = weight / density
The density of mercury = 13.5 g/mL
So the volume of mercury displaced by the aluminum is:
32.4 g / 13.5 g/mL = (32.4/13.5) mL = 2.40 mL
The volume of mercury displaced equals the volume of aluminum below the surface of the mercury.
So the answer is 2.40 mL (to 3 significant figures, which is the number of significant figures given for the density of Hg and the weight of the Al.)
2006-09-14 18:04:22 · answer #1 · answered by Mark V 4 · 1⤊ 0⤋
2.7/13.5= 1/5=20% of the aluminium will be below the surface. This is a volume of 0.2x32.4/2.7=2.4cc.
2006-09-15 01:02:54 · answer #2 · answered by zee_prime 6 · 0⤊ 1⤋
zee_prime is correct but I think density of mercury is 13.6.
2006-09-15 01:23:25 · answer #3 · answered by dwarf 3 · 0⤊ 0⤋
you left out many key figures.....what is the temp. .of the mercury...what is your defination of air ? how much nitrogen is present ?....you fail !!
2006-09-15 01:00:38 · answer #4 · answered by Anonymous · 0⤊ 1⤋
Who cares?
2006-09-15 00:53:07 · answer #5 · answered by Anonymous · 1⤊ 1⤋
i just finished a test 2 hours ago !!
2006-09-15 00:55:11 · answer #6 · answered by Agentj100 4 · 0⤊ 1⤋
cap the teacher in his leg and he will forget all about it ******
2006-09-15 00:48:05 · answer #7 · answered by meatgazer_i69 1 · 1⤊ 2⤋