Persent yield=actual/theretical*100%=220g/275.6g*100%=79.83%
First figure out how many grams must freeze and then convert the grams to moles.
<span>Hf = -334 J/g. Convert this to KJ/g by dividing by 1000. (There are 1000 Joules in a kJ). </span>
<span>Hf = -334 J/g ÷ 1000 J/kj = -0.334 kJ/g </span>
<span>Now, divide 100 kJ by -0.334 kJ/g (see how the units are lining up?) </span>
<span>100 kJ ÷ -0.334 kJ/g = 299 g </span>
<span>Now convert this to moles by dividing by the molecular weight of water (18.0g/mole). </span>
<span>299 ÷ 18.0 = 16.6 moles </span>
Answer:
ΔS = 0.0975 KJ/K
Explanation:
Trouton's rule relates the enthalpy and entropy of vaporization at the normal boiling point.
∴ Tbp = - 33.4°C ≅ 239.5 K
∴ ΔHvap = 23.35 KJ/mol
⇒ ΔS = (23.35 KJ/mol) / (239.5 K) = 0.0975 KJ/mol.K
for 1 mol of NH3:
⇒ ΔS = 0.0975 KJ/K
Answer:
The new volume is 1,000ml
Explanation:
Mathematically, we know that the number of moles per ml(volume) should be constant irrespective of the increase.
Initially, we have a volume of 500 ml and number of moles of 2.5 moles
The ratio of the number of moles to the volume is 2.5/500 = 0.005 mole/ml
Now, this is expected to remain the same even if we have an increment.
let’s call the new volume x
0.005 mol/ml = 5 moles/x ml
x = 5/0.005 = 1,000 ml
Answer:
True
Explanation:
A pH of 7 is greater than basic but lesser than acidic. Therefore, it's neutral