What is the limiting reactant when 19.9 g CuO react with 2.02 g H2?

Explanation:

use the equation

moles = mass/mr

=19.9/79.5

=0.250moles of CuO

then do the same for

H = 2.02/1

=2.02

so CuO is the limiting reagent because there is less amount of it.

Hope this helps  :)

i'm assuming that the correct answer is indeed the first one/ "a"..

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)