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Help With Questions - HSN forum

# Help With Questions

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### #1gary

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Posted 24 October 2004 - 09:54 AM

The mass of one mole of aluminium is 27g.
What is the mass of one aluminium atom?

What volume of Carbon dioxide is produced when 10cm3 of ethane is burnt in pure oxygen?

What volume of hydrogen is produced when 2g of magnesium reacts with excess hydrochloric acid according to the equation (assume the molar volume is 24 litres)

The combustion of ethan can be summarised by the equation

C2H6(g) = 3 1/2 02(g) gives 2CO2(g) + 3H20(g)

If air is 20%, by volume of oxygen how much air is needed to completely burn 10 litres of ethane?

### #2Dave

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Posted 24 October 2004 - 11:51 AM

1) 1 mol = 27g (1 mol = 6.02*10^23 atoms
1 atom = 27/ 6.02*10^23

2) c2H6 + 3.502 -> 2CO2 + 3H20
1 2
10 Cm3 20 cm3

3) Mg + 2HCl -> MgCl2 + H2

2g Mg = 2/24 moles = 0.083

0.083 -> 0.083

H2 produced = 0.083 moles = 0.083 * 24 = 2 litres

4) to burn 10 litres of ethane you need 35 litres of oxygen

35 litres of oxygen is found in 175 litres of air

If i am not here i am somewhere else

### #3gary

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Posted 24 October 2004 - 03:58 PM

Thanks again.

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