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nanayeboahford
Questions (2)
A gas with the smell of rotten eggs is evolved with dilute sulphuric acid is added to a simple of salt.the gas evolved could
1 answer
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20cm3 of saturated aqueous solution of hydrogen carbonate (iv) at 25^oc requires 10cm3 of 2.0moldm-3 hydrochloric acid for
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Answers (1)
let d=number of ducks reared c=number of cows reared sum of ducks and cows=d+c=9 sum of their legs=2d+4c=28 since duck has two legs and cow also has 4 legs the two equations give d+c=9...1 2d+4c=28...2 multiply eqn 1 by 2 2(d+c=9) which gives 4d+4c=18..3
