if the earth's atmosphere is on average roughly 2.3% water vapor, approximately how many molecules of water are present in the atmosphere?
a. 2.3 x 1043
b. 4.3 x 1024
c. 2.3 x 1020
d. 4.3 x 1020
e. 2.3 x 1024
--
Given the following densities at 25°C magnesium: 1.7 g/cm3 graphite: 1.8 g/cm3 iron: 7.9 g/cm3 A block of iron has a mass of 819 g. What is the mass of a block of magnesium that has the same volume as the block of iron?
a. 1.1 x 103 g
b. 2.8 x 103 g
c. 1.8 x 102 g
d. 3.8 x 103 g
e. none of these
--
A sample of a liquid with a density of 2.1 g/mL has a weight of 4.242 g. The volume of the liquid is:
a. 2.0 mL
b. 2.02 mL
c. 2 mL
d. 2.020 mL
--
The following calculation, (0.10 m)(1.0 x 10-4 km)(0.1 x 102 cm), can also be expressed as all of the following except:
a. (10 cm)(10 cm)(10 cm)
b. 1 L
c. 1000 mm
d. 103 cm3
e. 1000 mL
(I got A for this one...)
--
Can someone please show me steps?
2007-01-18
04:02:08
·
6 answers
·
asked by
Anonymous
in
Science & Mathematics
➔ Mathematics
I am in college.....I thought this was a place for help. I needed to check my answers.
2007-01-18
04:13:06 ·
update #1