Which is not a pure substance?
(C) antifreeze
Answer:
1.07 g of water.
Explanation:
A reaction between an acid and a base makes water and a salt as product.
Our reaction is:
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
Reactants are the acid and the base. Which is the limiting?
2.9 g . 1mol /98 g = 0.0296 moles of acid
3.53 g . 1mol / 40 g = 0.088 moles of base
2 moles of base react to 1 mol of acid
0.088 moles may react to (0.088 . 1)/2 = 0.044 moles of acid
And we only have 0.0296, sulfuric acid is the limiting
Ratio is 1:2. 1 mol of acid can produce 2 moles of water.
Our 0.0296 moles may produce (0.0296 . 2) /1 = 0.0592 moles of water.
We convert moles to mass:
0.0592 mol . 18g /mol = 1.07 g
Answer:
Final calculated molarity of the unknown acid be lower than the actual concentration.
Explanation:
Volume required unknown acid = V= 25.0 mL
Volume actually measure was more than V that is = V'
V' > V
Molarity of the solution is the moles of compound in 1 Liter solutions.
As we can see from the formula that molarity is inversely proportional to the volume of the solution.
- Molarity of solution decreases with increase in volume
- Molarity of solution Increases with decrease in volume.
We have added more volume than required which will be increase the volume of solution and the molarity of the solution will lower than the actual value.
Answer:
1) Pure water can conduct electricity because a small proportion of its molecules dissociate into ions . The two ions formed in water are, hydrogen ions, H +, and hydroxide ions, OH -.
2) dynamic equilibrium
Explanation:
I hope this helps!
Answer:
condensation can be found in the kinetic-molecular theory of gases . As heat is removed from a gas, the molecules of the gas move more slowly, and as a result, the intermolecular forces are strong enough to pull the molecules together to form droplets of liquid.