Answer:
mass (g) needed = 710.2 grams Na₂SO₄(s)
Explanation:
Needed is 2.5 Liters of 2.0M Na₂SO₄; formula wt Na₂SO₄ = 142.04g/mol.
mass (grams) of Na₂SO₄(s) = Molarity needed x Volume needed in Liters x Formula Wt of solute
mass (grams) of Na₂SO₄(s) = (2.5L)(2.0M)(142.04g/mol) = 710.2 grams Na₂SO₄(s)
Mixing: Transfer 710.4 grams Na₂SO₄ into mixing vessel and add water-solvent up to but not to exceed 2.5 Liters total volume. Mix until dissolved.
Gives 2.5 Liters of 2.0M Na₂SO₄(aq) solution.
I’m confused on the question?
Answer:
the answer is B) Planting native grasses in bare soil
Explanation:
I think i’ll say the answer is 6 mol b
Answer: -777.838
Explanation:
Given data,
Lattice energy (energy released to form NaCl )= 778 kJ/mol
Heat of solution = 162 Joules
= 0.162 kJ (converted to kilojoules)
Substitute the values in the given formula,
Enthalpy of hydration = ΔHsolution – ΔHlattice energy
= 0.162 – 778
Therefore, Enthalpy of hydration = -777.838