Physics
12.12.2020 10:20
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Consider the following thermochemical equation: 2ch3oh(l) + 3o2(g) → 2co2(g) + 4h2o(g)

Consider the following thermochemical equation:
2ch3oh(l) + 3o2(g) → 2co2(g) + 4h2o(g) ∆horxn = –1277 kj
what mass of water can be heated from 23.5°c to 88.2°c with the heat that is released from the combustion of 12.0 g of ch3oh (molar mass = 32.0 g/mol), assuming no heat is lost to the surroundings? specific heat capacity of h2o = 4.184 j/g°c.
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lilkit
lilkit
4,9(73 marks)

m_w=5.3248\times 10^{23}\ kg

Explanation:

According to the given reaction,

heat released by thecombustion of 2 molecules of Methanol, \Delta H=1277000\ J

we know that molecular mass of Methanol, m=32\ g.mol^{-1}

∴12 gram of methanol = \frac{3}{8}\ moles

we know 1 mole = 6.023\times 10^{23}\ molecules

so,

\rm \frac{3}{8} \ moles=2.258\times 10^{23}\ molecules

Heat from the combustion of 2.258\times 10^{23}\ molecules:

Q=1277000\times \frac{2.258\times 10^{23}}{2}

Q=1442132.0625\times 10^{23}\ J

Now the  mass of water that can be heated from 23.5°C to 88.2°C :

Q=m_w.c_w.\Delta T

1442132.0625\times 10^{23}=m_w.4186\times (88.2-23.5)

m_w=5.3248\times 10^{23}\ kg

Pizzapegasus1
Pizzapegasus1
4,4(75 marks)

In physics, a charged particle is a particle with an electric charge. ... It can also be an electron or a proton, or another elementary particle, which are all believed to have the same charge (except antimatter). Another charged particle may be an atomic nucleus devoid of electrons, such as an alpha particle. Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. It has no electric charge and a rest mass equal to 1.67493 × 10−27 kg—marginally greater than that of the proton but nearly 1,839 times greater than that of the electron.

Explanation:

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