Answer:
B
Explanation:
Molarity = 0.010M
Volume = 2.5L
Applying mole-concept,
0.010mole = 1L
X mole = 2.5L
X = (0.010 × 2.5) / 1
X = 0.025moles
0.025moles is present in 2.5L of NaOH solution.
Molar mass of NaOH = (23 + 16 + 1) = 40g/mol
Number of moles = mass / molar mass
Mass = number of moles × molar mass
Mass = 0.025 × 40
Mass = 1g
1g is present in 2.5L of NaOH solution
Answer:
The percent yield of carbon disulfide is 78.8%
Explanation:
Percent yield of reaction = (Produced yield / Theoretical yield) . 100
5C + 2SO₂ --> CS₂ + 4CO
In the reaction 5 moles of C, produce 1 mol of CS₂
40 g / 12 g/m = 3.33 moles
Then, this is the rule of three:
5 mol of C produce 1 mol of CS₂
3.33 moles of C, will produce ( 3.33 .1)/5 = 0.666 moles
Mol . molar mass = mass → 0.666 mol . 76.12 g/m =50.7 g (Theoretical yield)
(40 g / 50.7 g) . 100 = 78.8%
Answer:be careful and relax
Explanation:
Answer:
The total energy change, ΔE, in kilojoules = -61.93 kJ
Explanation:
Relationship between ΔH, ΔE and work done is given by first law of thermodynamics.
ΔE = ΔH - PΔV
Where,
ΔH = Change in enthalpy
ΔE = Change in internal energy
PΔV = Work done
Given that,
ΔH = -75.0 kJ = -75000 J
P = 43.0 atm
ΔV = Final volume - initial volume
= (2.00 - 5.00) = -3.00 L
PΔV = 43 × (-3.00) = -129 L atm
1 L atm = 101.325 J
-129 L atm = 129 × 101.325 = -13071 J
So ,
ΔE = ΔH - PΔV
= (-75000 J) - ( -13071 J)
= -75000 J + 13071 J
= -61929 J
Total energy change, ΔE = -61.929 kJ
