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henryzx900
22.06.2021 •
Physics
A copper (Cu) atom has 29 protons, 34 neutrons, and 29 electrons. What is
copper's atomic number?
O
A. 63
B. 29
C. 58
W
.
D. 34
Solved
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Ответ:
Ответ:
U for the reaction is 15,048.58 kJ/mol of pentane.
Explanation:
Quantity of heat required = heat capacity of bomb calorimeter × temperature rise = 5.23 kJ/C × (29.8 C - 23.7 C) = 5.23 kJ/C × 6.1 C = 31.903 kJ
Moles of pentane = mass/MW
Mass = 0.1523 g
MW of pentane (C5H12) = 72 g/mol
Moles of pentane = 0.1523/72 = 0.00212 mol
U for the reaction = quantity of heat required ÷ moles of pentane = 31.903 kJ ÷ 0.00212 mol = 15,048.58 kJ/mol