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# Reacting masses calcilations watch

1. what mass of nitrogen is produced when 2.00 tonnes of ammonia gas decomposes
2NH3 -> N2 + 3H2

What mass of lead (II) oxide is produced when 0.400 moles of lead (II) nitrate decomposes.
2Pv(NO3)2 -> 2PbOv+ 4 NO2 + O2
2. (Original post by 11ashh)
what mass of nitrogen is produced when 2.00 tonnes of ammonia gas decomposes
2NH3 -> N2 + 3H2

What mass of lead (II) oxide is produced when 0.400 moles of lead (II) nitrate decomposes.
2Pv(NO3)2 -> 2PbOv+ 4 NO2 + O2
hmm nice yr1 stuff

so try to get a table like this:
2NH3 -> N2 + 3H2
MASS 2
MOLES
MR 17 28 2

and then you can start to fill out the tables one by one, using mass/Mr=moles and using molar ratios etc
remember Mr is not affected by the number in FRONT of the symbol

(havent done this stuff since summer so might be wrong in some places)

answer to first one is 1.65t(again possibly wrong lol)
3. keep trying to get the table rightly aligned but doesnt work...
4. (Original post by just why?)
keep trying to get the table rightly aligned but doesnt work...

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