Help on Mole Concept! (1 Viewer)

[joeleneluu]

I'm new to Chemistry and am having trouble with questions such as:

- What volume of hydrogen will combine with 6.0L of nitrogen to form ammonia?

- What volume of oxygen is required to burn 1 Litre of ethane.

Any help?

 

[Riviet]

What volume of hydrogen will combine with 6.0L of nitrogen to form ammonia?

The law of combining gas volumes states that the volume of gases taking part in a chemical reaction show simple whole number ratios to one another when those volumes are measured at the same temperature and pressure.

This means that 1 litre of nitrogen gas reacts with 3 litres of hydrogen gas to produce 2 litres of ammonia gas.


3H_2(g) + N_2(g) -> 2NH_3(g)

Since all the reactants and products are gases, the mole ratio of N_2(g):H_2(g):NH_3(g) of 1:3:2 is also the ratio of the volumes of gases.

So 6L of nitrogen gas would react with 3 x 6 = 18L of hydrogen gas, since the ratio of the volumes of hydrogen gas to nitrogen gas is 3:1.

What volume of oxygen is required to burn 1 Litre of ethane.

Again, we write a balanced equation for the burning of ethane with oxygen:

C₂H_6(l) + 7/2 O_2(g) -> 2CO_2(g) + 3H₂O_(g)

From the equation, 7/2 L of oxygen would be required to burn 1 L of ethane.

 

[Sonic]

i'd love to add something but i think rivet summed that up beautifullly