JUPEB Chemistry Questions and Answers 2023 Legit Expo Answer
JUPEB Chemistry Questions and Answers 2023. You will see JUPEB Chemistry 2023 (Practical) Legit Free Chemistry expo answers and repeated JUPEB Chemistry questions 2023 for free Joint Universities Preliminary Examination Board runs/runs. You will also understand how JUPEB Chemistry Questions are set and how to answer them in order to have excellent JUPEB results.
The Joint Universities Preliminary Examination Board is an examination body in Nigeria that conducts the Advanced Level to study to gain admission directly to 200level at any private or public university in Nigeria.
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IMG WA IMG WA IMG WA IMG WAJUPEB 2023 CHEMISTRY ANSWERS
(4a)
The standard enthalpy of combustion is the change in enthalpy that occurs when one mole of a is completely burned in excess oxygen under standard conditions, which include a temperature of 298 K and a pressure of 1 atmosphere. It is usually measured in units of kilojoules per mole (kJ/mol) and represents the amount of heat released during the combustion reaction. The standard enthalpy of combustion is a useful parameter for calculating the energy content of fuels and other organic compounds.
(4bi)
(i)To calculate the mass of butane used, we need to use the heat released by burning it the heat capacity of water. From the problem, the heat produced by burning butane can be used to raise the temperature of water by 14.3°C, which is equivalent to:
q = (230 g) × (4.2 J/g°C) × (14.3°C) = 57.4 J
Since butane is the only source of heat, the heat released by burning it must be equal to the heat absorbed by water:
q = (mass of butane) × (ΔHcomb)
where ΔHcomb is the standard enthalpy of combustion of butane. Assuming no heat losses, we can use the ideal gas law to find the number of moles of butane:
PV = nRT
n = (PV)/(RT) = (98 kPa × 0.2 L) / [(8.31 J/mol K) × (25 + 273) K] = 0.0073 mol
From the balanced chemical equation for the combustion of butane:
2 C4H10(g) + 13 O2(g) → 8 CO2(g) + 10 H2O(g)
we see that 2 moles of butane produce 8 moles of CO2 and 10 moles of water. Therefore, 0.0073 moles of butane produce:
(10/2) × 0.0073 = 0.0365 moles of water
The mass of this amount of water is:
(0.0365 mol) × (18.015 g/mol) = 0.657 g
Therefore, the mass of butane used is:
q / ΔHcomb = (0.657 g) / (0.0073 mol × ΔHcomb)
Substituting the given values and solving for the mass of butane, we get:
m = q / (ΔHcomb) = (13757.4 J) / (0.0073 mol × (-2878 kJ/mol)) = 2.889 g
Therefore, the mass of butane used is 2.889 g.
(4bii) To determine the amount of heat released, we just need to use the specific heat capacity of water:
q = (230 g) × (4.2 J/g°C) × (14.3°C) = 13757.4 J
Therefore, the amount of heat released is 13757.4 J.
(4biii)To calculate the standard enthalpy of combustion of butane, we can use the mass of butane and the amount of heat released:
ΔHcomb = q / (m × n)
where n is the number of moles of butane:
n = m / M = 2.889 g / 58.12 g/mol = 0.0497 mol
Substituting the given values, we get:
ΔHcomb = (13757.4 J) / (2.889 g × 0.0497 mol) = -2851.8 kJ/mol
Therefore, the standard enthalpy of combustion of butane is -2851.8 kJ/mol.
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What is JUPEB?
Joint Universities Preliminary Examination Board (JUPEB) is a new Advanced Level examination body recently established and coordinated by the University of Lagos. The programme is similar to the Interim Joint Matriculation Board (IJMB), coordinated by the University of Lagos and recognized by many universities in Northern Nigeria.
Candidates who complete the ONE-YEAR programme, after examinations administered by JUPEB, will gain Direct Entry admission to 200 Level Degree programmes of Achievers University and other Universities in Nigeria. Through highly qualified tutors, Some University provides intensive lectures in relevant subject combinations in line with the JUPEB syllabus in the following subject combinations:
JUPEB SUBJECT COMBINATIONCandidates who complete this ONE-YEAR programme, after examinations administered by JUPEB, will gain Direct Entry admissions to 200 Level Degree programmes of some universities in Nigeria.
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