Please help!

Chemistry and homework help forum.

Organic Chemistry, Analytical Chemistry, Biochemistry, Physical Chemistry, Computational Chemistry, Theoretical Chemistry, High School Chemistry, Colledge Chemistry and University Chemistry Forum.

Share your chemistry ideas, discuss chemical problems, ask for help with scientific chemistry questions, inspire others by your chemistry vision!

Please feel free to start a scientific chemistry discussion here!

Discuss chemistry homework problems with experts!

Ask for help with chemical questions and help others with your chemistry knowledge!

Moderators: Xen, expert, ChenBeier

Post Reply
Posts: 1
Joined: Thu Jun 30, 2022 1:32 am

Please help!

Post by fekil »

1. Calculate the number of grams of magnesium chloride that could be obtained from 8.5 grams of hydrochloric acid when the latter is reacted with an excess of magnesium oxide.

2 Consider the reaction: FeS + O2 = Fe2O3 + SO3
Calculate the number of grams of

a) Fe2O3 produced from 7.2 moles FeS
b) O2 needed to react with 0.125 grams of FeS
c) So2 produced from 3.25 moles of O2
d) O2 needed to produce 0.180 moles of Fe2O3
e) FeS need to produce 0.125 grams of SO2

Please help me solve the problem.. I don't know how to do it..
User avatar
Distinguished Member
Distinguished Member
Posts: 1169
Joined: Wed Sep 27, 2017 7:25 am
Location: Berlin, Germany

Re: Please help!

Post by ChenBeier »

1. Get from all the compounds the molar Masses, check PSE for this.
2. Write down the correct balanced chemical equation
3. From the given masses calculated the moles by using n=m/M
4. Then do comparison how many moles hydrochloric correspond to how many moles magnesium chloride.
5. How this number calculate back to the demanded mass.
So now its your turn to Show us something.
Post Reply