# Confusing Stoichiometry Question

by pure kirk
Tags: confusing, stoichiometry
 P: 1 I got this question as an example question and I have no clue on how to solve part B Chlorine can be produced by the reaction: 2KMnO4 + 16HCl ->2KCl + 2MnCl2 + 5Cl2 + 8H2O (a)What mass of KMnO4 is required to produce 2.5 L of Cl2 gas measured at STP? For part A I got 7.05 g ( 0.044615 moll) (b) Calculate the volume of commercial hydrochloric acid required (Commercial grade hydrochloric acid is 36.0% HCl by weight, and has a density of 1.18 g mL^(–1)).
PF Gold
P: 1,427
 Quote by pure kirk I got this question as an example question and I have no clue on how to solve part B Chlorine can be produced by the reaction: 2KMnO4 + 16HCl ->2KCl + 2MnCl2 + 5Cl2 + 8H2O (a)What mass of KMnO4 is required to produce 2.5 L of Cl2 gas measured at STP? For part A I got 7.05 g ( 0.044615 moll)

 Quote by pure kirk (b) Calculate the volume of commercial hydrochloric acid required (Commercial grade hydrochloric acid is 36.0% HCl by weight, and has a density of 1.18 g mL^(–1)).
Can you start by figuring what mass of HCl you need?
P: 23,719
 Quote by DrClaude That is much too low. Please show your calculations.
I got 7.051 g as well:

 Sci Advisor PF Gold P: 1,427 Confusing Stoichiometry Question I'm sorry for the mistake. I used the density of Cl2 given by WolframAlpha, which is much higher.
 Admin P: 23,719 Looks like they are listing density of a liquid Cl2 - which doesn't make much sense at STP....