Question

In order to find the relative molecular mass of a liquid hydrocarbon, X, the liquid was injected into a syringe oven that was kept at a temperature of 100 °C. After vaporisation of the injected liquid it was found that 0.172 g of liquid produced 61.4 cm3 of vapour. The pressure was 1.01 × 105 Pa and the universal gas constant is 8.314 J K–1. a Calculate the relative atomic mass of the hydrocarbon. [5] b When 20 cm3 of the vapour of X was burned in oxygen, 120 cm3 of carbon dioxide were produced. Calculate the number of carbons in a molecule of X and hence find the molecular formula of X. [2] c Explain why iodine is soluble in X but sodium chloride is insoluble in X. [4] d Another hydrocarbon, Y, has a boiling point below that of X. Its vapour is kept in a sealed vessel at a temperature fixed just above its boiling point. The volume of the container is then reduced using a piston. The pressure is also measured. A graph to show how the pressure of the vapour varies as the volume is reduced is shown below. solution

Answer 1

1.for making the text look coloured refer the below syntax and ignore the dots

[.tex]\red{the\:text\:appears\:in\:red}[./tex]

result

\red{the\:text\:appears\:in\:red}thetextappearsinred

2.for making the text marquee

[.tex]<marquee>{the\:text\:appears\:like\:this}</marquee>[./tex]

result

= < marquee > {the\:text\:appears\:like\:this} < /marquee > <marquee>thetextappearslikethis</marquee>

3. for making the text look bold

[.tex]\bold{the\:text\: appears\: like\: this }[./tex]

result =

\bold{the\:text\: appears\: like\: this }thetextappearslikethis

4. for showing the exponential value

[.tex]{no.}^{power}[./tex]

result

= {no.}^{power}[ /tex] 5. for showing the square root value [.tex]\sqrt{no.}[./tex] result = $\sqrt{no.}no. </p><p>power</p><p>$5.forshowingthesquarerootvalue[.tex]

no.

[./tex]result=[tex]

no.

\bold{\boxed{thanx}}

thanx

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