a gaseous compound of carbon and hydrogen, in a volume of 300ml at a temperature of 300K and a pressure of 1.200atm, furnishes 1.054g of H20 and 1.930g of CO2 when burned in excess oxygen. Calculate the molecular formula of the hydrocarbon.
i use 300ml =0.3dm3, 300k , 1.200atm and PV=nRT,i can calculate the no. of mole of compound of carbon and hydrogen.then.... i dont know how to calculate the molecular formula?
2006-10-18 19:42:38 · 3 個解答 · 發問者 ? 1 in 科學 ➔ 化學
Assume the molecular formula is CxHy
CxHy + excess oxygen --> (y/2) H2O + x CO2
From the above chemical equation,
When you can calculate the no. of mole of H2O and CO2 evolved,
then you can know what x and y are.
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其實同volume, temp., 無關~~
因為你已經有product的mass和molar mass
a gaseous compound of carbon and hydrogen is NOT neccessarily has formula of CnH(2n+2)
2006-10-19 13:40:12 · answer #1 · answered by Terry 3 · 0⤊ 0⤋
只是想提醒你
R = 0.08206
而不是 8.314，因為你用的單位並非 SI
2006-10-20 20:06:26 · answer #2 · answered by ? 7 · 0⤊ 0⤋
Hydrocarbon has the form of C(n)H(2n+2)
since there should be only one compound exist, based on what you have done,
determine the ratio of C to H and expand to fit in the form of C(n)H(2n+2).
Hope this helps.
2006-10-19 05:38:33 · answer #3 · answered by kewym99 7 · 0⤊ 0⤋