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for reaction 1:can anyone tell me how to solve this question?
View attachment 33872
use molar gas volume to calculate the no of moles of Oxygen.http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s03_qp_1.pdf
anyone who can help me with Q1
calculate the Mr of NAN3 ...Most modern cars are fitted with airbags. These work by decomposing sodium azide to liberate
nitrogen gas, which inflates the bag.
2NaN3 3N2 + 2Na
A typical driver’s airbag contains 50 g of sodium azide.
Calculate the volume of nitrogen this will produce at room temperature.
A 9.2 dm3 B 13.9 dm3 C 27.7 dm3 D 72.0 dm3
I'm re-posting this.. anyone??http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w09_qp_51.pdf
Could someone please help me with qn no. 2(a) of this paper? To calculate the mass of zinc, why do we have to use (B - D) and not (B - A)?
Thanks
we need to know the amount of zinc that was used. To do that we have to subtract the total zinc from that which remained in excess. Thus B-DI'm re-posting this.. anyone??
That makes perfect sense.. dunno why I couldn't think of that.we need to know the amount of zinc that was used. To do that we have to subtract the total zinc from that which remained in excess. Thus B-D
Do you get it?
If we do B-A we will only subtract the weight of empty test tube and that will only give us the mass of zinc we took initially and is not any help.
If there is further problem do ask
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