Quick (easy) GCSE question Watch

micah114
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#1
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#1
I suck at Science and would just like some quick help.
Question:
In the reaction between sodium and water, hydrogen gas is given off and sodium hydroxide is formed. The gas is collected and there is found to be 1.8 moles of hydrogen.
a) What mass of sodium would have been used in this reaction?
b) What mass of water would have reacted with this sodium?
I found a) to be 41.4g and b) to be 32.4g
Could someone please quickly tell me if this was right or not?
Thanks in advance.
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Compass_girl
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um shouldnt ur answer for question "b"
be double the answer you got because sodium and water react in a 1:2 ratio respectively

so mass of water = 3.6moles x 18 = 64.8g?
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micah114
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I dont know thats why im asking
I was struggling with the whole "The mole" topic but think I may finally have the hang of it.
Thanks for your help.
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Hedgeman49
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This is in GCSE Chemistry? I only did my GCSEs last year, but we never came across the mole... only learned about it in AS Module 1.
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Compass_girl
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hehe
yeh i think its supposed to be double due to the reaction ratios ............damn i should relaly know this for definite seeing as im doing A2 chem *rollseyes* :P
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tom_tom_tom
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(Original post by Hedgeman49)
This is in GCSE Chemistry? I only did my GCSEs last year, but we never came across the mole... only learned about it in AS Module 1.
i did the mole in yr 9

i did do triple science thou!
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micah114
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(Original post by Hedgeman49)
This is in GCSE Chemistry? I only did my GCSEs last year, but we never came across the mole... only learned about it in AS Module 1.
It's AQA Additional Chemistry. I think "The Mole" is one of the hardest topics in it >.<
Apparently, this course is meant to be easier than most courses around at the moment and it's the only one our school offers in year 11 anyway.
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