According to the following reaction how many grams of ammonium nitrate are needed to form 27.1 grams of water?First create the balanced chemical reaction
NH4NO3 → 2H2O + N2O
We're starting at 27.1 grams of water since that's the information provided to us in the problem.
We need to convert this to grams of ammonium nitrate using dimensional analysis.
We can't go to grams of water to grams of ammonium nitrate in one step.
If you want to convert from one molecule to another, you first have to change to moles.
Our conversion will look like:
grams H2O →moles H2O→moles NH4NO3 → grams NH4NO3
Try to remember this pattern since grams of one compound to grams of another is quite a common conversion
The calculation is as follows:
27.1g H2Ox(1 mol H2O/18.02g H2O)x(1 mol NH4NO3/2 mol H2O)x(80.06g NH4NO3/1 mol NH4NO3)
Use the molar mass to convert from moles of a substance to grams of that substance
Use the mole to mole ratio to convert from moles of one substance to moles of another