One mole of a hydrocarbon containing 48g of carbon. If itvapour density is 28,the hydrocarbon is? Please explain your answer thanks.?
To determine the hydrocarbon, we need to find the molecular formula. The first step is to calculate the empirical formula.
1. Calculate the number of moles of carbon:
Mass of carbon = 48 g/mol
Molar mass of carbon = 12 g/mol
Moles of carbon = Mass of carbon / Molar mass of carbon = 48 g / 12 g/mol = 4 moles
2. Determine the number of moles of hydrogen:
Given that the hydrocarbon's vapor density is 28, we can determine that the molecular mass of the compound is 28 g/mol. Since vapor density is defined as the ratio of the molecular mass of a compound to 2 (molecular mass / 2), the empirical formula is derived from these ratios.
Vapor density = Molecular mass / 2
28 = Molecular mass / 2
Molecular mass = 2 x Vapor density = 2 x 28 = 56 g/mol
Now, since we know the mass of carbon in the compound is 48 g and the total molar mass is 56 g/mol, we can deduce the following:
Mass of hydrogen = Total mass - Mass of carbon = 56 g/mol - 48 g/mol = 8 g/mol
Moles of hydrogen = Mass of hydrogen / Molar mass of hydrogen = 8 g / 1 g/mol = 8 moles
3. Find the ratio of carbon to hydrogen:
Divide the number of moles of each element by the smaller number of moles to get the simplest ratio. In this case, both values are integers, so there is a 1:1 ratio between carbon and hydrogen.
Therefore, the empirical formula for the hydrocarbon is CH.
To find the molecular formula, we need additional information about the molecular mass of the hydrocarbon. Without this information, we cannot determine the specific hydrocarbon.