2006-09-20 07:33:46 · 10 answers · asked by Sir_john_Jr 1 in Science & Mathematics ➔ Chemistry
Water has a molecuar mass of 18, this means it weights 18 g per mole. A mole is 6.0221415E23 molecules (Avogadro's number). If you have 1 g of water, you therefore have 1/18 of a mole, or 3.34E22 molecules. That is a lot. If you could count 1 billion molecules per second, you'd still need a million years to count them all.
2006-09-20 07:39:15 · answer #1 · answered by Vincent G 7 · 4⤊ 1⤋
1 mole of water = 18grams so 25grams of water = 25/18(1 mole) 1mole = 6x10^23 Molecules So 25/18(6x10^23) = the number of molecules in 25grams of water. That ok?
2016-03-17 02:45:27 · answer #2 · answered by Anonymous · 0⤊ 0⤋
For the best answers, search on this site https://shorturl.im/awVP1
1mole = 6.02e23 molecules Water = 1 gram per mole 25g water = 25 moles 25 moles(6.02e23 molecules per mole) = 1.505e25 molecules
2016-04-06 01:25:19 · answer #3 · answered by Anonymous · 0⤊ 1⤋
water is H2O, which means 2 H's and 1 O [but judging by the question you're posing, I suppose you already know that..]
the molar mass of H2O is 2(the molar mass of H)+1(the molar mass of O)
Hydrogen's molar mass is 1.01g and oxygen's 16g (both rounded)
2(1.01)+16=18.02g
Now, you say it's only one gram, that will be 1/18.02 of a mole.
Each mole has 6.022*10^23 atoms [Avogadro's number].
moles*number of molecules per mole=number of molecules!
so
1/18.02*6.022(10^23)=VERY approximately (10^23)/3, or ~3333333333333333333333.33333.... molecules. Scientifically expressed: 3.333*10^22
result is very approximate, to find the actual number do
6.022(10^23)/18.02.
2006-09-20 09:04:39 · answer #4 · answered by Maziar S 3 · 5⤊ 0⤋
1 mol H2O -> 2*1+16=18g H2O
x mol H2O -> 1g H2O
x = 1/18 moles are in 1 g H2O
in 1 mole they are 6.023*10^23 molecules
so in 1g H2O you have 6.023*10^23/18 molecules
6.023*10^23 is the Avogadro's constant that defines the mole
2006-09-20 07:43:27 · answer #5 · answered by Mariana 2 · 2⤊ 0⤋
I've lost 5 kilos in my first week. It's my 10th day and I have included salad with some protein (eg. egg/ lean chicken) as you suggested. After 4 years of trying, the fat is finally coming off. It truly feels like magic!
Get started today!
2016-05-24 22:12:54 · answer #6 · answered by Karen 4 · 0⤊ 0⤋
Approximately 3.345 × 10 to the 22nd
2006-09-20 07:39:22 · answer #7 · answered by PaulCyp 7 · 1⤊ 0⤋
How many molecules are in an atom?
2006-09-20 07:44:08 · answer #8 · answered by Lone Eagle 4 · 2⤊ 2⤋
1/18 of Avogadro's number (6.023E23). You should be able to figure out why.
2006-09-20 07:36:03 · answer #9 · answered by Anonymous · 0⤊ 0⤋
lol never counted
2006-09-20 07:38:56 · answer #10 · answered by Anonymous · 2⤊ 3⤋