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Give me a hint to solve this question,

what should my first step ?

should convert the grams into moles ?

aluminum= (54g/150g)= 36% ( percent composition of aluminum) sulphur= 64%

0.36x=20 (36 percentage of what is 20)

x=20/0.36 x=55.5 grams

is there a more easy way ? to do in mind

  • 2
    $\begingroup$ Stoichiometry problems should generally be solved by converting to moles, using the appropriate stoichiometric rations, and converting back to a desired quantity. $\endgroup$
    – Zhe
    May 18, 2018 at 14:55

1 Answer 1


You might consider writing a correctly balanced equation, and then convert grams to moles.

  • $\begingroup$ i have edited the question now, $\endgroup$
    – Ali
    May 18, 2018 at 14:47
  • $\begingroup$ That is certainly one way to do it, and the answer appears to be correct. There are other ways to approach this problem, but I'm not sure they are any easier than your approach. The answer would be given to 1 significant figure, so the correct choice would be 60 g. $\endgroup$
    – Dr. J.
    May 18, 2018 at 16:18
  • $\begingroup$ i really appreciate your answer , $\endgroup$
    – Ali
    May 19, 2018 at 15:38
  • $\begingroup$ but this website is very dumb, physics forums is best, any one can ask any type of question, ,, ,,,,, they are saying you have to wait one day for your next question ,,,,,,,, very dumb thinking, $\endgroup$
    – Ali
    May 19, 2018 at 15:39
  • $\begingroup$ please block my acount, I don't want to be her e, thankyou for your dumb service , meanwhile physics forums has given me 32+ replies . $\endgroup$
    – Ali
    May 19, 2018 at 15:40

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