chemistry.

posted by .

Which hydrocarbon pair below have identical mass percentage of C?
A: C3H4 and C3H6
B: C2H4 and C3H4
C: C2H4 and C4H2
D: C2H4 and C3H6
E: None of the above

My answer is E...Can any one help me?

• chemistry. -

I think you are correct. To have the identical mass percentage of C the "other" compound must have a multiple of C with the same multiple of H and none of the answers qualify.

• chemistry. -

A trick to solving this type of problem is to reduce all of the ratios to either their simplest form or a percentage.

Ex. 3C/6H => 2C/4H => 1C/2H = 50% C

1/2 is the simplest form, and the molecule is 50% Carbon.

With this in mind, you should look over your options once more.

• chemistry. -

all of above is wrong.
i have the same question for school.

• chemistry. -

should be D: C2H4 and C3H6
both give you the ratio 1:2

Similar Questions

1. Chemistry

The equation for the complete combustion of ethene (C2H4) is C2H4(g) + 3 O2(g) ==> 2CO2(g) + 2H2O(g) If 2.70 mol C2H4 is reacted with 6.30 mole O2, identify the limiting reagent. show all work.
2. Chemistry!

Use the equation below and determine what volume of O2 at STP is needed to react with 1.5 moles of C2H4?
3. chemistry

A 79.9-L sample of a gaseous hydrocarbon, measured at 1.00 atm pressure and 25.0°C, is burned in excess oxygen, liberating 4.24 × 10^3 kJ of heat at constant pressure. What is the identity of the hydrocarbon?
4. Chemistry

how many C2H4 molecules are contained in 45.8 mg C2H4 when the molar mass of C2H4 is 28.05g/mol
5. chemistry

Consider the reaction, C2H4(g) + H2(g) ® C2H6(g), where DH = – 137 kJ. How many kilojoules are released when 55.3 g of C2H4 reacts?
6. chemistry

carbon 85.6% and H 14.4 % is their composition of mass. what is their molecular formula examples below C2H6 C3H4 CH4 C2H4 C3H8
7. Chemistry

C2H4(g) + H2O(l) → C2H5O(l) what is the rendition percentage if 4.50g of C2H4 produce 4.7g of ethyl alcohol?
8. chemistry

If 15.0 grams of C3H6, 10.0 grams of oxygen, and 5.00 grams of NH3 are reacted, what mass of acrylonitrile can be produced assuming 100% yield, what mass of the excess reactants remain?
9. Chemistry

Which of the following molecules has a double bond?
10. Chemistry

In the dehydrogenation of ethane two reactions take place: C2H6 => C2H4 + H2 C2H6 + H2 => 2CH4 The mass distribution of the product is: 27% C2H6; 33% C2H4; 13% H2; 27% CH4. 1. What was the conversion of C2H6 to CH4?

More Similar Questions