Question

How many moles of hydrogen can react with 8.30 moles of nitrogen? how many grams of ammonia, NH3, will be formed?

Answer 1

`"mass of ammonia"=282.76g`
`"moles of hydrogen"=24.9"moles"`

Explanation:

The chemical equation is
`3H_2+N_2=2NH_3`

`"number of moles"="mass"/"molar mass"`

We are given the number of moles of nitrogen as 8.30

The ratio of the number of moles of hydrogen to nitrogen to ammonia is `3:1:2`. This means that there is twice as many of ammonia as there is nitrogen --> nitrogen:ammonia is `1:2`

Therefore, there are `8.3times2=16.6` moles of ammonia
The molar mass of ammonia is `14.01+1.008times3=17.034`

Finally, we can calculate the mass of ammonia
`"mass"="number of moles"times"molar mass"`
`"mass"=16.6times17.034`
`"mass"=282.7644g`
which to 2 decimal place since the numbers in the question is also to 2 decimal places is `"mass"=282.76g`

For the number of moles of hydrogen, you will notice that hydrogen:nitrogen is `3:1` which means that there are thrice as many moles of hydrogen as there are nitrogen.
Hence, you go `8.3times3=24.9`moles