is the answer 179? if not, then please tell me how to get the correct answer.
2007-11-04 12:54:38 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
You are right about the answer. I do not know how your teacher wants you to proceed, but this is my procedure.
Change ml to Liters. So, 250.0ml becomes 0.250L
Use this formula. D = MM * P/RT ( Density is 2.00g/0.250L )
2.00g/0.250L = MM*1.00atm/0.08206Latm/molK * 273.15K
just cross multiply.
0.250MM = 44.829378
molar mass = 179.317512
The answer you posted.
2007-11-04 13:11:04 · answer #1 · answered by Anonymous · 0⤊ 0⤋
there is an exceptionally functional and nicely customary equation: volume of a a million mol of gas at STP = 22.4 litres you've 0.512 litres. hence you've 0.512/22.4 = 0.0229 mol of the gas 0.0229 mol has mass = 0.555g a million mol has mass = 0.555/0.0229 = 24.3g Molar mass of gas = 24.3g/mol
2016-10-23 10:06:18 · answer #2 · answered by lisbon 4 · 0⤊ 0⤋
Let the gas be called G.
2.00gG/250.0mLG x 22,400mLG/1molG = 179gG / 1molG which is the molecular weight.
At STP, one mole of gas occupies 22.4L or 22,400mL
2007-11-04 13:03:00 · answer #3 · answered by steve_geo1 7 · 0⤊ 0⤋
PV=nRT
1 * .250 = n * .0821 * 273
n= .011 moles of the gas
so;
2g / .011mol = 181.81g
So you did it right, we just followed different rounding rules.
2007-11-04 13:02:06 · answer #4 · answered by I Know Nothing 6 · 0⤊ 0⤋