Naoh (aq) + h2so4 (aq) > h2o + naso4 (aq)

Explanation:

Let's correct and balance the given equation:

is sodium hydroxide, charge of sodium is +1, charge of hydroxide is -1, so it's fine; is sulfuric acid, charge of hydrogen cation is +1, charge of sulfate is -2, sulfate is balanced by the two protons; is firstly a molecule, it's water, in its liquid state, the oxidation state of +1 for the two hydrogens is balanced by the oxidation state of -2 for oxygen;sodium sulfate should be , since sulfate has a charge of -2, this would require two sodium cations to balance it.

The equation becomes:

We require 2 NaOH in order to balance the two sodium cations on the right, this would yield a total of 4 hyrogens on the left, so we also need two water molecules to balance it fully:

4.62 KG

Step-by-step explanation:

1000 grams = 1kg

3kg = 3000g

4 kg = 4000g

1.5 = 1500g

left over potatoes = 3000 - 1500 = 1500 g or 1.5kg

left over onions = 4000 - 880 = 3120 = 3.12kg

total kilos not used = 1.5 + 3.12 = 4.62