### 11.53 sig figs

Posted: **Wed Nov 29, 2017 6:42 pm**

by **vicenteruelos3**

a reaction mixture that consists of .400 mol H2 and 1.60 mol I2 was introduced into a 3.00 Liter flask and heated. at equilibrium, 60.0% of the hydrogen gas had reacted. what is the equilibrium constant K for the reaction.

why is the answer in 2 sig figs?

### Re: 11.53 sig figs

Posted: **Wed Nov 29, 2017 7:51 pm**

by **Krupa Prajapati**

Hi! For question 53, when we use the ICE box to find the equilibrium concentrations for H2, I2, and 2HI, we use subtraction. For finding the equilibrium concentration of H2, we take 0.133 M and subtract 0.800 M. The result is we have 0.053 M of H2, which is only 2 significant figures. When we calculate the K value the equation is as follows.

K = [0.160]^2/([0.053][0.453])

Since we have a value with only 2 significant figures involved, 0.053, the answer is only 2 significant figures, 1.1