## Video Module: Calculate Reaction Quotient

Allyson Charco Dis1G
Posts: 21
Joined: Fri Sep 29, 2017 7:04 am

### Video Module: Calculate Reaction Quotient

Calculate the reaction quotient, QC, from the following equilibrium data collected in a 3.00 L sealed reaction vessel for the reaction: AsH3 (g) ⇌ As (s) + H2 (g)
AsH3 = 5.55 x 10-4 mol, As = 3.31 x 10-3 mol, H2 = 1.23 x 10-3 mol.

2AsH3 = 2As + 3H2

The reason I can not solve for this equation is because when I balance the equation the equation has coefficients and when I want to set up the ice table I do not know what ratio I would use can someone explain please.
what would we use for the change in equilibrium? since the ration is 1:1:1.5 how would the remaining.
would it be
No Idont know how the ratio would look like to solve and also do we have to divide the mol by l to get the molL^-1 so would that mean I would divide 5.55 x 10^-4/3? if anyone could possibly explain thank you.

Silvino Jimenez 1A
Posts: 52
Joined: Fri Sep 29, 2017 7:04 am

### Re: Video Module: Calculate Reaction Quotient

The reaction quotient Qc is the ratio between the [P] and [R] at their current/provided values.
Here you are given number of moles.

In order to determine concentration from number of moles:

Divide number of moles / by volume (L)

Use these molarities as your concentartion amounts to determine Qc by plugging in these molarity values for [P]/[R].

We do not consider concentration of the solid
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