2NH2 + CO2 -> (NH2)2CO + H2O

supposed to mix 6 37.2 G of ammonia with 1,142 g of carbon dioxide, how many grams of urea will be obtained?

Approximately .

Explanation:

Look the relative atomic mass of each element on a modern periodic table:

Calculate molar mass values from relative atomic mass:

.

.

Calculate the number of moles of each reactant:

.

.

One of the two reactants might be in excess. To find the limiting reactant, calculate the ratio .

.

However, in the equation, the ratio between the coefficient of and is .

Since , the species on the numerator ( in this case) is the limiting reactant.

As a result, should be calculated from , not .

In the equation, the coefficient ratio .

Apply this ratio:

.

Calculate using its molar mass value:

.

Note: the last digit might be inaccurate due to rounding errors.

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