₦airaland Forum

Good morning nairalanders......

Pls,I will appreciate if someone can solve these empirical problems 4 me in chemistry..................
.....giving me tough time

#- 20cm^3 of a gaseous hydrocarbon were mixed with 90cm^3 oxygen,& the mixture exploded.
At room temperature,60cm^3 of gas were left.40cm^3 of the gas (carbon (iv) oxide ) were absorbed by sodium hydroxide,leaving 20cm^3 of oxygen..

Find the empirical formula of the hydrocarbon.

#- 10cm^3 of a gaseous hydrocarbon were mixed with excess oxygen & ignited... The total gas volume was measured at room temperature & pressure before & after combustion,& it was found that it contracted by 20cm^3. On shaking,the remaining gases with excess potassium hydroxide solution,the gas contracted by a further 40cm^3.
What's the molecular formula of the hydrocarbon.

And lastly,

#- 6.10g of boron reacted completely with 22.9g of chlorine to give 29.0g of the metallic chloride.
Calculate the empirical formula of the chloride..

Thanks in anticipation....
Working & simplicity is the principle aspect,thanks...