Chemistry, 01.10.2019 17:20 mauifrifer3986

Oxyacetylene torches produce such high temperature that they are often used to weld and cut metal. when 1.53 g of acetylene (c2h2) is burned in a bomb calorimeter with a heat capacity of 10.69 kj/k, the temperature increases from 20.486°c to 44.688°c. what is δe (in kj/mol) for this combustion reaction? enter to 0 decimal places.

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Answer from: bobby3350

The ΔE (in kJ/mol) for this combustion reaction is 4385 kJ/mol

We know that the number of moles = mass/molar mass

where;

molar mass of acetylene = 26.04 g/mol

From the given information, the number of moles of acetylene used:

= 1.53 g/26.04 g/mol

= 0.059 mol

When a given mass of fuel is burned in a bomb calorimeter with a known heat capacity, we can estimate the heat evolved during combustion by measuring the temperature change.

∴

Heat evolved = heat capacity × change in temperature

Heat evolved = 10.69 kJ/K × (44.688 - 20.486)K

Heat evolved = 10.69 kJ/K × 24.202K

Heat evolved = 258.719 kJ

We know that the heat of combustion ΔE is the amount of heat evolved by the complete combustion of 1 mole of a gas.

∴

$\mathbf{\Delta E = \dfrac{heat \ evolved}{n}}$

$\mathbf{\Delta E = \dfrac{258.719 \ kJ}{0.059 mol}}$

$\mathbf{\Delta E = 4385 \ kJ/mol}$

Learn more about the heat of combustion here:

link

Answer from: godisgoodallthoubxi7

4403kJ/mole

Explanation:

First we have to calculate the heat absorbed by bomb calorimeter

Formula used :

$q_b=c_b\times (T_{final}-T_{initial})$

q_b = heat absorbed by calorimeter = ?

c_b = specific heat of = 10.69 kJ/K

$T_{final}$ = final temperature = 44.688^oC=(273+44.688)K=317.688K

$T_{initial}$ = initial temperature = 20.486^oC=(273+20.486)K=293.486K

$q_b=10.69kJ/K\times (317.688-293.486)=258.7kJ$

As heat absorbed by calorimeter is equal to the heat released by acetylene during combustion.

Thus 1.53 gram of acetylene releases heat of combustion = 258.7kJ

So, 26.04 g/mole of acetylene releases heat of combustion $\frac{258.7}{1.53}\times 26.04=4403kJ/mole$

Therefore, the heat of combustion of acetylene is, 4403kJ/mole

Answer from: Quest

We can’t you if you only tell us that you have to show us what the answers are

Answer from: Quest

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

$^{m}_{4}x$ and $^{m}_4y$

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

$^{m}_{5}x^{-}$

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be $^{9}_{5}be^{-}$ and $^{9}_{4}be$ .

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.

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