3 years ago

1 Point

Chemistry

1 answer:

inna [77]3 years ago

3 0

Answer:

KINETIC ENERGY

Explanation:

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Methanol, CH3OH, has been considered as a possible fuel. Consider its oxidation: 2 CH3OH(l) + 3 O2(g) → 2 CO2(g) + 4 H2O(g) ΔG =

Inessa [10]

Answer: Maximum work that can be obtained by given amount of methanol is -343kJ.

Explanation:

For the given chemical reaction:

$2CH_3OH(l)+3O_2(g)\rightarrow 2CO_2(g)+4H_2O(g);\Delta G_{rxn}=-1372kJ/mol$

By Stoichiometry of the reaction:

2 moles of methanol does a work of 1372 kJ.

So, 0.5 moles of methanol will do a work of = $\frac{1372kJ}{2}\times 0.5=343kJ$

Hence, maximum work that can be obtained by given amount of methanol is -343kJ.

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3 years ago

Given that the molar mass of carbon is 12 g/mol and the molar mass of oxygen is 16 g/mol, calculate the molar mass of carbon dio

nekit [7.7K]

Molar mass of oxygen is:
M(O)=16 g/mol
Molar mass of carbon is:
M(C)=12 g/mol
Molar mass of carbon dioxide is:
M(CO2)=M(C)+2*M(O)
M(CO2)=12 g/mol+2*16g/mol
M(CO2)=44 g/mol

Molar mass(M) is the mass of 1 mole of the substance (grams per mole of a compound).

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3 years ago

A mechanical pencil has a mass of 47.4 grams. The volume of the pencil is 15.8 cubic centimeters. What is the density of the pen

BlackZzzverrR [31]

Density = mass over volume
so
47.4g/15.8cm^3
=3g/cm^3

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3 years ago

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During the period from about 1800 to about 1865, the atomic weights of many elements were accurately measured. Why was this impo

tatiyna

I believe Mendeleev formed his periodic table by atomic weight (nowadays we do it by atomic number) so he likely used those values.

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