how many moles of water are in 92 grams of water?
and also
Calcuim chloride is 36.11% calcuim by mass. How many grams of Calcuim are in 40.00 grams of calcuim chloride?
Answer if you know Please! Thankyou!
2007-05-14 15:15:14 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Add up the mass numbers of 2 H's and 1 O to get the total mass units in H2O (water): two 1's plus one 16 equals 18 for the water molecule.
That means that a mole of water is 18 grams.
So if you have 92 grams of water, that is 92/18 = 5 and 1/9 moles.
And the second question's answer is just 36.11% of 40 grams = 14.444 grams.
2007-05-14 15:20:08 · answer #1 · answered by actuator 5 · 1⤊ 0⤋
Labby, you need to know fundamental concepts of Chemistry or you wouldn't be asking this stuff.
The first is that a mole is the mass in grams equivalent to the atomic weight of its components. For instance, one mole of water is 18 grams (H2 = 2, O=16). So moles in 92 grams is 92/18.
The second is that mass to mole ratios are constant. Calcium chloride mole weight is about 111. Calcium atomic weight is 40. So
40/111 = 0.3611= x/ 40. Solve for x
2007-05-14 15:25:31 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋
Water is H20, which means you have one oxygen and two hydrogen atoms in a molecule. One molecule has a molecular weight of 18 atms. One mol, therefore will have 18 grams of mass, therefore there are 5.1111 moles in 92 grams of water.
If Ca is 36.11% of the molecule in mass, you simply multiply the mass by the percentage to get 14.444 g = 0.3611*40.
2007-05-14 15:21:46 · answer #3 · answered by Anonymous · 0⤊ 0⤋
continuously write the balanced equation first. 2H2 plus O2 yields 2H2O Now get your l0 grams of hydrogen into moles. Moles H2 = grams hydrogen divided by using grams hydrogen in step with mole so Moles H2 = l0g over 2g/mole = 5 moles H2 gasoline. Now using the balanced equation above, over the hydrogen place 5 moles and under the hydrogen place its coefficient of two moles. Now over the oxygen interior the comparable equation place X moles and under the oxygen place its coefficient of one mole. Now bypass multiply and resolve for X moles of oxygen which seems to be 2.5 moles oxygen.
2016-12-17 12:51:31 · answer #4 · answered by ? 4 · 0⤊ 0⤋
i believe there are 5.11 moles of water in 92 grams of water and there are about 14.44 grams of calcium in calcium chloride.
2007-05-14 15:26:43 · answer #5 · answered by sg1freek 2 · 0⤊ 0⤋
tricky point. query over a search engine. it can assist!
2014-12-08 20:14:25 · answer #6 · answered by Anonymous · 0⤊ 0⤋
i didn't even know moles could swim...
2007-05-14 15:21:05 · answer #7 · answered by Anonymous · 0⤊ 1⤋