How many grams of #K_2CO_3# are needed in order to produce 2.0 mol #K_2O#?

1 Answer
Jun 2, 2016

Answer:

# Mass_(\ K_2CO_3)= 2.8xx10^2 g#

Explanation:

When heated, #K_2CO_3# decomposes according to the following equation:

#K_2CO_3 -> K_2O + CO_2#

The molar mass of # K_2CO_3 = 138.21 \ g. mol^-1#

#2.0 \ mol. K_2O xx (1 \ mol. K_2CO_3)/(1 \ mol. K_2O) xx(138.21 \ g \ K_2CO_3) / (1 \ mol. K_2CO_3) #

#2.0 \cancel( mol. K_2O) xx ( 1 \color(red) cancel( mol. K_2CO_3))/(1 \ cancel(mol. K_2O)) xx(138.21 \ g \ K_2CO_3) / (1 color(red) cancel(\ mol. K_2CO_3) ) #

#= 2.8xx10^2 g#