Question

Ethanol (C2H5OH) melts at -114 ∘C and boils at 78 ∘C. The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/mol. The specific heat of solid and liquid ethanol are 0.97 J/g⋅K are 2.3 J/g⋅K respectively. Q: A) How much heat is required to convert 36.5 g of ethanol at 35 ∘C to the vapor phase at 78 ∘C? B) How much heat is required to convert 36.5 g of ethanol at -167 ∘C to the vapor phase at 78 ∘C?

Answer #1

A)

mass of ethanol = 36.5 g

moles of ethanol = 36.5 / 46.07 = 0.7923

35 -------- 78 oC

Q = m Cp dT + n x deltaHvap

= 36.5 x 2.3 x (78 - 35) + 0.792 x 38.56 x 10^3

= 3609.85 + 30551

Q = 34161 J

**heat required = 34.16 kJ**

B)

- 167 -------- - 114 ---------- 78

Q1 = 36.5 x 0.97 x (167 - 114)

= 1876.46 J

Q2 = 0.7923 x 5.02 x 10^3

= 3976.84 J

Q3 = 36.5 x 2.3 x (78 + 114)

= 16118.4 J

Q4 = 0.7923 x 38.56 x 10^3

= 30551 J

total heat = Q1 + Q2 + Q3 + Q4

= 52522.8 J

**heat required = 52.52 kJ**

Ethanol (C2H5OH) melts at -114 ∘C and boils at 78 ∘C. The
enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of
vaporization is 38.56 kJ/mol. The specific heat of solid and liquid
ethanol are 0.97 J/g⋅K are 2.3 J/g⋅Krespectively.
A. How much heat is required to convert 40.5
g of ethanol at 36 ∘C to the vapor phase at 78 ∘C?
B. How much heat is required to convert 40.5
g of ethanol at -161 ∘C to...

Ethanol (C2H5OH) melts at -114 ∘C and boils at 78 ∘C. The
enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of
vaporization is 38.56 kJ/mol. The specific heat of solid and liquid
ethanol are 0.97 J/g⋅K are 2.3 J/g⋅Krespectively.
A) How much heat is required to convert 26.5 g of ethanol at 34
∘C to the vapor phase at 78 ∘C?
B) How much heat is required to convert 26.5 g of ethanol at
-160 ∘C to...

Ethanol (C2H5OH) melts at -114 °C. The enthalpy of fusion is
5.02 kJ/mol. The specific heats of solid and liquid ethanol are
0.97 J/g•K and 2.3 J/g•K, respectively. How much heat (kJ) is
needed to convert 25.0 g of solid ethanol at -125 °C to liquid
ethanol at -40 °C

Ethanol (C2H5OH) melts at -114 °C. The enthalpy of fusion is
5.02 kJ/mol. The specific heats of solid and liquid ethanol are
0.97 J/g-K and 2.3 J/g-K, respectively. How much heat (kJ) is
needed to convert 25.0 g of solid ethanol at -135 °C to liquid
ethanol at -60 °C?
A. 207.3
B. -13.3
C. 6.34
D. 3617
E. 8.63

Ethanol, C2H5OH, (MW 46.06 g/mol) melts at
-114 °C. The enthalpy of fusion is 5.02 kJ/mol. The specific heats
of solid and liquid ethanol are 0.97 J/g-K and 2.3 J/g-K,
respectively. How much heat (kJ) is needed to convert 20.0 g of
solid ethanol at -135 °C to liquid ethanol at -50 °C?
please show work

Ethanol (C2H5OH) melts at -114°C. The
enthalpy of fusion is 5.02 kJ/mol. The specific heats of solid and
liquid ethanol are 0.97 J/gK and 2.3 J/gK, respectively. How much
heat (kJ) is needed to convert 25.0 g of solid ethanol at -135°C to
liquid ethanol at -50°C?

Ethanol (C2H5OH) melts at -114°C. The enthalpy of fusion is 5.02
kJ/mol. The specific heats of solid and liquid ethanol are 0.97
J/gK and 2.3 J/gK, respectively. How much heat (kJ) is needed to
convert 25.0 g of solid ethanol at -135°C to liquid ethanol at
-50°C?
A) 207.3 kJ
B) -12.7 kJ
C) 6.91 kJ
D) 4192 kJ
E) 9.21 kJ
Show all your calculations.

Ethanol (C2H5OH) melts at -114 C. The enthalpy of fusion is 5.02
kJ/mol. The specific heats of solid and liquid ethanol are 0.97J /
gK and 2.3 J / gK, respectively. How much heath (kJ) is needed to
convert 25.0 g of solid ethanol at -125 C to liquid ethanol at -80
C?

Ethanol (C2H5OH) boils at 78∘C. Its density is 0.789 g/mL. The
enthalpy of vaporization is 38.56 kJ/mol. The specific heat of
liquid ethanol is 2.3 J/g−K.
1. How much heat is required to convert 25.0 g of ethanol at 30
∘C to the vapor phase at 78 ∘C?
2. Place the following substances in order of decreasing
volatility: CH4, CBr4, CH2Cl2, CH3Cl, CHBr3, and CH2Br2. Rank from
most volatile to least volatile. To rank items as equivalent,
overlap them.
3....

How much heat energy is required to convert 21.1 g of solid
ethanol at -114.5 °C to gaseous ethanol at 191.5 °C? The molar heat
of fusion of ethanol is 4.60 kJ/mol and its molar heat of
vaporization is 38.56 kJ/mol. Ethanol has a normal melting point of
-114.5 °C and a normal boiling point of 78.4 °C. The specific heat
capacity of liquid ethanol is 2.45 J/g·°C and that of gaseous
ethanol is 1.43 J/g·°C.
________kJ

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