chemistry

in an experiment a sample of hydrocarbon was analyzed. The sample contained6 g of carbon and 1.344 g Hydrogen.
a) whats the empirical formula?
the density of hydrocarbon at 25 C and 1.09 atm is 1.96 g/L
b.) whats the molar mass of the hydrocarbon?
c) whats the molecular formula?

1. 👍 0
2. 👎 0
3. 👁 125
1. 1. Calculate percent C and percent H.
2. Take a 100 g sample, and convert percent to grams C and H.
3. Convert grams to moles C and moles H. moles = grams/atomic mass.
4. Find the ratio of C and H to each other in small whole numbers. The easy way to do that is to divide the smaller value by itself; then divide the other number by the same small number. Round to whole numbers but don't round if the value is more than 0.1 away from a whole number. In that case, multiply each number by a factor (2x, 3x, 4x, 5x etc) until you obtain two whole numbers within rounding of 0.1.
b. After the formula is obtained, just add the atomic masses.
c. Use PV = nRT. For density that is
P*molar mass = density*R*T.

Post your work if you stuck.

1. 👍 0
2. 👎 0

Similar Questions

1. Chemistry

7. A 100.00g sample of the gaseous hydrocarbon ethane is a gaseous hydrocarbon, with 79.89g of carbon and 20.11g of hydrogen. Ethylene is a different gas phase hydrocarbon. A 100.00g sample of ethylene has 85.63g of carbon with

asked by Alissa L on August 28, 2016
2. Chemistry

A 100.00g sample of the gaseous hydrocarbon ethane is a gaseous hydrocarbon, with 79.89g of carbon and 20.11g of hydrogen. Ethylene is a different gas phase hydrocarbon. A 100.00g sample of ethylene has 85.63g of carbon with 14.37

asked by Alissa L on August 29, 2016
3. chemistry

Consider a sample of a hydrocarbon (a compound consisting of only carbon and hydrogen) at 0.959 atm and 298 K. Upon combusting the entire sample in oxygen, you collect a mixture of gaseous carbon dioxide and water vapor at 0.755

asked by Jaxx on February 27, 2015
4. Chemistry

Sorry to bother again. I'm stuck in these two problems as well. 1. A 27.0 g smaple of an unknown hydrocarbon was burned in excess oxygen to form 88.0 g of carbon dioxide and 27.0 g of water. What iss a possible molecular formula

asked by Anonymous on September 9, 2007
5. CHEMISTRY

I've been trying to do this problem but I would get confused and stuck.. Consider a sample of a hydrocarbon at 0.959 atm and 298 K. Upon combustion the entire sample in oxygen, you collect a mixture of gaseous carbon dioxide and

asked by J on November 7, 2008
6. AP Chemistry

a 5.15g sample of a hydrocarbon is burned in oxygen, producing 15.6g of carbon dioxide and 8.45g of water. Assuming an excess of oxygen, what is the empirical formula of the hydrocarbon?

asked by Ariday on September 13, 2011
7. Chemistry

A 10.0 mL volvume of Ultra Bleach is diluted in a volumetric flask. A 25.0 ml sample of this solution is analyzed accordign to the procedure in this experiment. Given that 33.75 mL of 0.135 M Na2S2O3 are needed to reach the

asked by Ashley on January 24, 2012
8. chemistry

The amount of organic carbon in a sample can be obtained by IR analysis of the carbon dioxide (CO2) released following complete combustion of the sample in oxygen. A reference sample of an organic compound is usually used to