Hey when they ask to find volume at STP which formula should we use ? Is it the the molar volume formula V=n×Vm or the ideal gaz equation formula PV=nRT ?
Hi you can use 22.7dm^3/moles. This is what it says in the oxford textbook: At STP the balloons will have identical volumes of 22.7 dm^3*moles^-1. This is the molar volume of an ideal gas and it is constant at a given temperature and pressure.
Urea, (H2N)2CO, is excreted by mammals and can be used as a fertilizer.
Urea can also be made by the direct combination of ammonia and carbon dioxide gases. 2NH3(g) + CO2(g) ⇌(H2N)2CO(g) + H2O(g) Calculate the maximum volume of CO2, in cm3, produced at STP by the combustion of 0.600 g of urea, using sections 2 and 6 of the data booklet
i'm not entirely sure about that. Is there any information on moles, or pressure, or anything else? ml is a measure of volume (1000 ml is equal to 1 dm^3). Using the PV=nRT formula, you would be able to get the mass.
If you have info on moles, pressure, and temperature, here is how you find mass from volume:
1. Isolate n which stands for moles in PV=nRT which means n = (PV)/(RT) 2. Calculate value of n (R is a constant btw, it's 8.31 J/(K*moles)) 2. Find mass from n by: g = (g/mol <- you can use your 64.07 value here)/mol
Hey when they ask to find volume at STP which formula should we use ? Is it the the molar volume formula V=n×Vm or the ideal gaz equation formula PV=nRT ?
ReplyDeleteHi you can use 22.7dm^3/moles. This is what it says in the oxford textbook: At STP the balloons will have identical volumes of 22.7 dm^3*moles^-1. This is the molar volume of an ideal gas and it is constant at a given temperature and pressure.
DeleteThis is a past paper question on it, for example:
DeleteUrea, (H2N)2CO, is excreted by mammals and can be used as a fertilizer.
Urea can also be made by the direct combination of ammonia and carbon dioxide gases.
2NH3(g) + CO2(g) ⇌(H2N)2CO(g) + H2O(g)
Calculate the maximum volume of CO2, in cm3, produced at STP by the combustion of 0.600 g of urea, using sections 2 and 6 of the data booklet
Markscheme (1 dm^3 = 1000cm^3 btw):
«V =
0.600 g/(60.07 g /mol)×(22700 cm^3/ mol) =» 227 «cm^3»
I've got a question that says that there is 10ml of so2 in a gas syringe. Calculate the mass
ReplyDeletehow do you solve it?
btw, the molecular mass of so2 is 64.07g/mol
i'm not entirely sure about that. Is there any information on moles, or pressure, or anything else? ml is a measure of volume (1000 ml is equal to 1 dm^3). Using the PV=nRT formula, you would be able to get the mass.
DeleteIf you have info on moles, pressure, and temperature, here is how you find mass from volume:
Delete1. Isolate n which stands for moles in PV=nRT which means n = (PV)/(RT)
2. Calculate value of n (R is a constant btw, it's 8.31 J/(K*moles))
2. Find mass from n by: g = (g/mol <- you can use your 64.07 value here)/mol