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Let us define first the characteristics of a combustion reaction. It is a reaction that involves reacting a combustible compound with oxygen gas. A compound is combustible if it burns in the presence of oxygen. When the compound is a hydrocarbon, it is made up of C and H atoms, both of which are combustible. You can separate the reactions for C and H.
C + O₂ → CO₂
2 H + 1/2 O₂ → H₂O
So, when a hydrocarbon undergoes combustion, you would expect that the products are always CO₂ and H₂O. Now, let us focus on the reaction for carbon, because we are given with the amount of CO₂ produced. According to the reaction, for every 1 mole Carbon reacted, 1 mole of CO₂ is produced. Knowing that the molar mass of C is 12 g/mol and CO₂ is 44 g/mol,
11 g CO₂ * (1 mol CO₂/44 g) * (1 mol C/1 mol CO₂) * (12 g C/mol)
Amount of C reacted = 3 grams
The percent mass of carbon in the hydrocarbon sample is equal to
Percent mass = (Amount of C reacted/Mass of sample)*100
Percent mass = (3/6)*100
Percent mass = 50%
Salt and sugar would dissolve in the water, wood, iron, and glass wouldn't dissolve
Answer: 1560632 joules
Explanation:
The change in thermal energy (Q) required to heat ice depends on its Mass (M), specific heat capacity (C) and change in temperature (Φ)
Thus, Q = MCΦ
Given that:
Q = ?
Mass of frozen water (ice) = 1kg
C = 4184 J/(kg K)
Φ = (Final temperature - Initial temperature)
= 100°C - 0°C = 100°C
Convert 100°C to Kelvin
(100°C + 273) = 373K
Then, Q = MCΦ
Q = 1kg x 4184 J/(kg K) x 373K
Q = 1560632 joules
Thus, the change in thermal energy is 1560632 joules
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