Calculating Moles of MgIn2S4 from Given Masses of Mg, In, and S

  • Thread starter Thread starter nirajnishad
  • Start date Start date
  • Tags Tags
    Air Mass
AI Thread Summary
To determine the number of moles of MgIn2S4 from one gram each of Mg, In, and S, first calculate the moles of each element using their atomic masses. The moles calculated are 0.04167 for Mg, 0.00871 for In, and 0.03125 for S. The limiting reactant will dictate the maximum moles of MgIn2S4 that can be formed, which is based on the smallest number of moles available. The moles of the compound cannot be found by simply adding the moles of the individual elements; instead, use the molar mass of MgIn2S4 to find the total moles from the limiting reactant. The correct approach is to identify the limiting reactant and then calculate the moles of the compound accordingly.
nirajnishad
Messages
16
Reaction score
0

Homework Statement



How many moles of MgIn2S4 can be made from one gram each of Mg, In, and S? Atomic masses are given.

Homework Equations


Moles = mass/molecular mass


The Attempt at a Solution



I have found the moles of each entity.

Mg - 0.04167 moles
In - 0.00871 moles
S - 0.03125 moles

Do I find the moles of the compound mentioned by adding the moles I have found here or do I say that the mass of the strange compound I have here is 3 g and that the moles formed are 3/(32 + 24 + 114.8 = molar mass of MgIn2S4)?

How do I proceed?
 
Physics news on Phys.org
I'm sorry for the misleading title of the thread. It should be finding the number of moles!
 
Thread 'Confusion regarding a chemical kinetics problem'
TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...

Similar threads

Replies
16
Views
3K
Replies
14
Views
11K
Replies
25
Views
3K
Replies
6
Views
2K
Replies
3
Views
6K
Back
Top