Ammonia Chemical Bonding Worksheet Page 20
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28M4.
(a)
1213.8 to 1214.3
gains 3 marks without working
correct answer not given then check working
1) moles of N
=
= 35.7 mol
2
1 mark for each correct step
do not penalise rounding errors in this part
2) moles of NH
= 2 × (answer from (1)) = 71.4 mol
3
3) mass of NH
= (answer from 2) × 17 = 71.4 × 17 = 1214 g
3
3
or
→ 34g of NH
•
28g of N
2
3
1 mark for each correct step
•
1g of N
→
= 1.214g NH
2
3
do not penalise rounding errors in this part
→ 1000 × 1.214
•
1000 g of N
2
= 1214g
allow error carried forward eg
or
•
1000 ×
gains 2 marks if correct answer not given
1000 ×
gains 1 mark, 2 marks if correctly calculated
(823.5g) 1000 ×
gains 1 mark if calculated correctly (1647.05g)
or
other correct methods
look for the key ideas in the methods above
Page 20 of 28
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