Three volatile compounds X,Y, and Z each contain elements Q. The precent by weight of element Q in each compound was determined. Some of the data obtained are given below
Percent by weight Molecular
Compound of Element Q Weight
X 64.8% ?
Y 73.0% 104.
Z 59.3% 64.0
(a) the vapor density of compound X at 27 degress C and 750.mm Hg was determined to be 3.53 grams per litre. Calculate the molecular weight of compound X.
(b) Determine the mass of the element Q contained in 1.00 mole of each of the three compounds.
(c) Calculate the most probable value of the atomic weight of element Q
(d) Compound Z contains carbon, hydrogen, and element Q. When 1.00 gram of compound Z is oxidized and all of the carbon and hydrogen are converted to oxidized, 1.37 grams of CO2 and 0.281 gram of water are produced. determine the most prbable molecular formula of compound Z
Now I know how to do a by using gRT/PV but how do i get the rate?
To calculate the rate of a gas, you need to know the volume of the gas and the time it takes to fill or empty that volume. In this case, the rate is not provided in the question, but rather the vapor density is given for compound X.
Vapor density is defined as the ratio of the mass of a compound relative to the mass of an equal volume of a reference gas at the same temperature and pressure. In this case, the reference gas is likely hydrogen, which has a vapor density of 2.016 g/L.
The formula to calculate vapor density is:
Vapor Density = (Molar Mass of Compound X) / (Molar Mass of Reference Gas)
To find the rate, you need to rearrange the formula to solve for the molar mass of Compound X:
Molar Mass of Compound X = Vapor Density * Molar Mass of Reference Gas
Given that the vapor density of Compound X is 3.53 g/L, and the molar mass of hydrogen is 2.016 g/mol, you can substitute these values into the formula to calculate the molar mass of Compound X.