1. 1 mole of HCl is equal to __________g(grams) of HCl
2. 1 mole of CaCl2 is equal to __________ g of CaCl2
3. 2 moles of (NH4)2SO4 (ammonium sulfate) is equal to _________g of ammonium sulfate
i dont understand how to do these at all anyhelp will be appreciated
2007-03-29 06:45:01 · 9 answers · asked by stacie b 2 in Science & Mathematics ➔ Chemistry
A mole can be expressed as gram/mole equal to the Molecular weight of the compound: -
1)...HCl = 1 + 35.5 = 36.5g/mol. (1xH + 1xCl)
2)...CaCl2 = 40 + 71 = 111g/mol. (2xCa + 2xCl)
3)...(NH4)2SO4 = 28 + 8 + 32 + 64 = 132 x 2 moles
....... = 264g/mol. ........2 x (2xN + 8xH + 1xS + 4xO).
2007-03-29 07:09:55 · answer #1 · answered by Norrie 7 · 1⤊ 0⤋
Err. Just find the molecular weight of the Substance.
In HCl, its 1 + 35.5 = 36
So gram molar mass of HCl is 36.5,
ie 1 mole of HCl = 36.5 grams,
Similarly for CaCl2 and ammonium sulphate. I don't remember the molecular weight of Ca. Was it 40 or 41?
The basic thing is, that you find the molecular weight and write a " gram " next to the number you get. That is the gram molecular weight of the compound, and that is the mass of 1 mole of that substance.
If you have 2 moles, multiply the gram molecular weight by 2, and so on. So gram molar weight of a substance is the weight of 6.023 * 10^23 ions / atoms/ molecules of that substance, and is the same as moleculer weight, only usually, when you say molecular weight, its in amu. and GMW is in grams.
2007-03-29 06:51:57 · answer #2 · answered by shrek 5 · 0⤊ 0⤋
A stress is a stress utilized to an area! moles is a volume degree. they're 2 thoroughly different recommendations! make efficient you understand this, that's considered necessary. besides, if the gas behaves completely stress does matter upon the quantity of mols (and not grams) of a substance, that is maximum in all probability why you instructor became grams into mols. it really is a few thing really ordinary to do. only grab a periodic table, verify the molar mass of helium (that is about 4 grams in accordance to mol) and divide the mass of helium (a million,65g) by technique of that is molar mass (4g). that promises the nuymber of mols (0,413).
2016-12-02 23:40:13 · answer #3 · answered by Anonymous · 0⤊ 0⤋
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2016-05-16 06:24:10 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Multiply the number of moles by the Mr (= sum of Ar values).
I'll do the first one:
1 x (1 + 35.5) = 36.5g HCl
2007-03-29 06:48:52 · answer #5 · answered by Gervald F 7 · 0⤊ 0⤋
2) 1 mole CaCl2
Ca = 40.078 g/mole Cl 35.5 g/mole
Ca + 2 Cl = 40.078 +2(35.5) = 111.078 g/mole
so you'd need 111.078 g
3) 2 moles (NH4)2SO4
N=14.0067 H=1.0079 S= 32.066 = 15.9994
NH4 = 14.0067+4(1.0079)= 18.038 g/mole
SO4 = 32.066 + 4(15.9994)= 96.0636 g/mole
(NH4)2SO4 = 2(18.038)+96.0636 = 132.1396 g/mole
2 mole would be 264.2792 g
2007-03-29 06:59:16 · answer #6 · answered by Dr Dave P 7 · 0⤊ 0⤋
1) 36.5g
2) 111g
3) 132 x 2 = 264g
2007-03-29 06:55:01 · answer #7 · answered by Brewmaster 4 · 0⤊ 0⤋
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2014-12-08 20:08:43 · answer #8 · answered by Anonymous · 0⤊ 0⤋
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2007-03-29 06:53:17 · answer #9 · answered by Indiana Frenchman 7 · 0⤊ 1⤋