How much heat is required to convert 2.73 g g of water at 32.0 ∘ C ∘C to steam at 100.0 ∘ C ∘C ? (Δ H vap ( H 2 O)=40.7kJ/mol,Heatcapacity( H 2 O)=4.184J/g ∘ C) (ΔHvap(H2O)=40.7kJ/mol,Heatcapacity(H2O)=4.184J/g∘C) Express your answer with the appropriate units.

Question

14-04-2020
Chemistry

contestada

How much heat is required to convert 2.73 g g of water at 32.0 ∘ C ∘C to steam at 100.0 ∘ C ∘C ? (Δ H vap ( H 2 O)=40.7kJ/mol,Heatcapacity( H 2 O)=4.184J/g ∘ C) (ΔHvap(H2O)=40.7kJ/mol,Heatcapacity(H2O)=4.184J/g∘C) Express your answer with the appropriate units.

Respuesta :

Otras preguntas

mark bought 8 boxes a wekk later half of all his boxes were destroyed in a fire there are now only 20 boxes left with how many did he start with show work

Why does the frequency of a wave increase as the wavelength decreases? A) because the wave speed remains constant B) because the amplitude of the wave must rema

While examining a coolant leak from a weep hole on the side of a Detroit S60 engine, Technician A says the leak is caused by a leaking liner O-ring. Technician

To succeed in building a competitive advantage, a company's strategy must aim at Select one: a. Charging a premium price for a superior product or service b.

If marijuana were legalized, it is likely that there would be an increase in the supply of marijuana. Advocates of marijuana legalization argue that this would

In which of the following situations should you use your vehicle's hazard lights? A. You're stopped on the side of the road with an engine that won't start. B.

7, 21, 63, __, 567, __, ...

Two cylinders (one hollow, one solid) made of linear elastic materials with the same outer diameter and length are subjected to the same external torque. Neithe

A 4-year-old boy had an apparent seizure. He is conscious and calm and is sitting on his mother's lap. His father is sitting in a nearby chair. The child's moth

Calculate difference, ΔH-ΔE=Δ(PV) for the combustion reaction of 1 mole of heptane. (Assume standard state conditions and 298 K for all reactants and products.)

gbustamantegarcia054 gbustamantegarcia054 · Answer 1 · 2020-04-15T07:27:41+02:00

gbustamantegarcia054 gbustamantegarcia054

15-04-2020

Answer:

Q = 7898.38 J = 7.898 KJ

Explanation:

Q = mCΔT + ΔHv

∴ ΔHv H2O = 47 KJ/mol = 47000 J/mol

∴ molar mass H2O = 18.015 g/mol

⇒ ΔHv H2O = (47000 J/mol)*(mol/18.015 g) = 2608.94 J/g

∴ m H2O = 2.73 g

⇒ ΔHv H2O = (2.73 g)(2608.94 J/g) = 7122.406 J

∴ C H2O = 4.18 J/g°C

∴ ΔT = 100 - 32 = 68°C

⇒ Q = (2.73 g)(4.18 J/g°C)(68°C) + 7122.406 J

⇒ Q = 775.975 J + 7122.406 J

⇒ Q = 7898.38 J

Answer Link

thomasdecabooter thomasdecabooter · Answer 2 · 2020-04-15T09:48:12+02:00

Answer:

We need 6942.7 J of heat

Explanation:

Step 1: Data given

Mass of water = 2.73 grams

Initial temperature of water = 32.0 °C

Final temperature of water = 100 °C

Heat capacity of water = 4.184 J/g°C

ΔHvap(H2O) = 40.7kJ/mol

Step 2 : Calculate heat required to heat water from 32.0 °C to 100 °C

Q = m*c*ΔT

⇒with Q = the heat required = TO BE DETERMINED

⇒with m= the mass of water = 2.73 grams

⇒with c = the specific heat of water = 4.184 J/g°C

⇒with ΔT = The change of temperature = T2 - T1 = 100 °C - 32. 0°C = 68.0 °C

Q = 2.73 * 4.184 * 68.0 °C

Q = 776.7 J

Step 3: Calculate moles H2O

Moles H2O = mass H2O / molar mass H2O

Moles H2O = 2.73 grams / 18.02 g/mol

Moles H2O = 0.1515 moles

Step 4: Calculate heat required to change water from liquid to gas phase

Q = moles H2O*ΔHvap(H2O)

Q = 0.1515 moles * 40700J/mol

Q = 6166 J

Step 5 : Calculate the total heat required

Q = 776.7 J + 6166 J

Q = 6942.7 J

We need 6942.7 J of heat