Chemistry, 04.02.2020 22:48 mepuppy5000

Using a molar heat of combustion of –890 kj/mol, the minimum mass of methane that must be burned to warm 5.64 kg of water from 21.5°c to 77.4°c, assuming no heat losses to the environment is ab. c g.

put your answer for ab. c in the blank.

Answers: 1

Show answers

Answers

Answer from: morganluvsblueow9wtm

23.78 g.

Explanation:

Firstly, we need to calculate the amount of heat needed to warm 5.64 kg of water from 21.5°C to 77.4°C using the relation:

Q = m.c.ΔT,

where, Q is the amount of heat absorbed by water (Q = ??? J).

m is the mass of water (m = 5.64 kg = 5640.0 g).

c is the specific heat capacity of water (c = 4.186 J/g.°C).

ΔT is the temperature difference (final T - initial T) (ΔT = 77.4 °C - 21.5 °C = 55.9 °C).

∵ Q = m.c.ΔT

∴ Q = m.c.ΔT = (5640.0 g)(4.186 J/g.°C)(55.9 °C) = 1319745.336 J ≅ 1319.745 kJ.

As mentioned in the problem the molar heat of combustion of methane is - 890.0 kJ/mol.Using cross multiplication we can get the no. of moles of methane that are needed to be burned to release 1319.745 kJ:

Combustion of 1.0 mole of methane releases → - 890.0 kJ.

Combustion of ??? mole of methane releases → - 1319.745 kJ.

∴ The no. of moles of methane that are needed to be burned to release 1319.745 kJ = (- 1319.745 kJ)(1.0 mol)/(- 890.0 kJ) = 1.482 mol.

Now, we can get the mass of methane that must be burned to warm 5.64 kg of water from 21.5°C to 77.4°C:

∴ mass = (no. of moles needed)(molar mass of methane) = (1.482 mol)(16.04 g/mol) = 23.78 g.

Answer from: Quest

they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

can i get the brainiest answer

i answered it first

Answer from: Quest

Mass is the amount of matter in an object. weight is the measurement of the pull of gravity on an object. say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165) now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon. however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant. in conclusion it is possible for your weight to change as your mass remains constant.

Another question on Chemistry

Chemistry, 21.06.2019 22:10

Here’s one way to follow the scientific method. place the missing steps in the correct position in the process

Answers: 1

Answer

Chemistry, 21.06.2019 23:40

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Answers: 2

Answer

Chemistry, 22.06.2019 01:30

If 34.2 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 299 kelvin and 1.21 atmospheres? 2 li (s) + 2 h2o (l) yields 2 lioh (aq) + h2 (g)

Answers: 3

Answer

Chemistry, 22.06.2019 12:30

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d

Answers: 1

Answer

You know the right answer?

Using a molar heat of combustion of –890 kj/mol, the minimum mass of methane that must be burned to...

Questions