Combustion of hydrogen releases 142 j/g of hydrogen reacted. how many kj of energy are released by the combustion of 16.0 oz of hydrogen? (1 lb = 16 oz; 1 kg = 2.2 lb)

Given the mass of hydrogen = 16.0 oz

Converting 16.0 oz hydrogen to pounds (lb) using the conversion factor 1 lb = 16 oz:

Converting 16.0 lb to g using the conversion factors 1 kg = 2.2 lb, 1 kg = 1000 g:

Heat of combustion of hydrogen = 142 J/g

Calculating the heat released when 16.0 oz is combusted:

64.61 kJ of energy is released by the combustion of 16.0 oz of hydrogen

Delta H reaction (ΔH) is the amount of heat/heat change between the system and its environment

(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)

The reaction of a substance with oxygen is called a combustion reaction

the combustion of hydrogen is

This equation shows that 2 Hydrogen molecules react with 1 molecule of oxygen to produce 2 molecules of water

In this combustion reaction will produce large thermal energy because it involves breaking the hydrogen gas bond, so the reaction is exothermic

The combustion of hydrogen releases 142 j / g of hydrogen reacted.

Combustion of 16.0 oz of hydrogen will release heat of:

16 oz = 1 lb = 0.455 kg = 455 g

For each gram Hydrogen releases 142 J, then for 455 g releases:

142 x 455 J = 64610 J = 64.61 kJ

the complete combustion of methane

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grams of o2 are required to burn 17.0 gal of c8h18

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moles of oxygen are required to produce 2.33 moles of water

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Keywords: Combustion of hydrogen, ΔH reaction, water, oxygen, exothermic

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.