Not understanding on how stoichiometry works not sure which side to start on. ex: How many grams of water are required to form 75.9 g of HNO3? Assume that there is excess NO2 present. The molar masses are as follows: H2O = 18.02 g/mol, HNO3 = 63.02 g/mol.

3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

Explanation:

We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.

Mᵣ:                            18.02           63.02

              3NO₂(g) + H₂O(ℓ) ⟶ 2HNO₃(aq) + NO(g)

m/g:                                               75.9

You start with the substance for which they give you numbers.

For example, this question gives you the mass of HNO₃ and asks you to find the mass of water.

You start with the mass of HNO₃.

Then you convert mass of HNO₃ ⟶ moles of HNO₃ ⟶ moles of water ⟶ mass of water

(a) Moles of HNO₃

(b) Moles of H₂O

(c) Mass of H₂O

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)

50.23 i believe is correct but don't quote me on that.