Question

Based upon the following equation: 2 K + 2 HCl --> 2 KCl + H2 How many moles of K are needed to form 0.3 moles of H2? *

a) 0.15
b) 0.3
c) 0.6
d) 0.9

Answer 1

From the given balanced chemical reaction it is signified that in every 1 mole of H2 will require 2 moles of K. Using the concept of ratio and proportion, with x being the number of moles of H2,
2/1 = 0.3/x
The value of x from the equation, 0.15 moles.