1. I worked out the molar mass of Na2S203 = 158.2 2. Then using the molar mass of the whole compound (248.2) - I divided it by 12.41 and got: 0.05 3. I multiplied 0.05 by 158.2 to get 7.91
Somehow I think I'm wrong too ... Is that the correct answer?
1. I worked out the molar mass of Na2S203 = 158.2 2. Then using the molar mass of the whole compound (248.2) - I divided it by 12.41 and got: 0.05 3. I multiplied 0.05 by 158.2 to get 7.91
Somehow I think I'm wrong too ... Is that the correct answer?
No idea, no MS available for june 2012 papers, but why is the moles the same for anyhdrous, doesnt that mean less amount?
I mean the moles, 90 is the molar mass, why is the moles the same when anhydrous is less??
The moles of the Na2S2O3 is the same, because it is not affected by the heat. Heating up the compound, removes the water but the salt is left behind - unaffected.