a. 5.00x10^24
b. 3.00
c. 2.90x10^25
d. 1.81x10^24
e. 4.00
2007-03-09 15:41:17 · 4 answers · asked by harry p 1 in Science & Mathematics ➔ Chemistry
avagadro's number, 6.02 x 10^23 molecules / mole is used to convert.
48.2 g CH4 x (1 mole CH4 / 16 g CH4) x (6.02 x 10^23 molecules / mole) = 1.81 x 10^24 = d
2007-03-09 15:47:03 · answer #1 · answered by scurvybc 3 · 0⤊ 0⤋
Stoichiometry!
OK, so you've got 48.2 grams of CH4. How many moles of CH4 is that? (Convert from grams to moles using molar mass; figure out the molar mass by using the atomic weights shown on the periodic table. Remember you will need 1 carbon atom and 4 hydrogen atoms.
Once you know how many moles of CH4 you have, then you can convert to molecules by using Avogadro's number. (6.022x10^23 molecules in one mole of a substance.)
Try it, you can do it!
2007-03-09 15:46:25 · answer #2 · answered by kittenpie 3 · 0⤊ 0⤋
D mol wt of methane is 16 g. So 48.2 g is slightly more than 3 moles. Each mole has 6.02x10^23 molecules.
2007-03-09 15:45:03 · answer #3 · answered by cattbarf 7 · 0⤊ 0⤋
mol wt=16
48.2/16=3.0125 moles
3.0125*6.023*10^23=1.81442875*10^24
d. 1.81x10^24 is correct
2007-03-09 15:48:25 · answer #4 · answered by yupchagee 7 · 0⤊ 0⤋