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kolezko [41]
3 years ago
8

How many atoms are in 4.5 moles of Cu

Chemistry
1 answer:
sergeinik [125]3 years ago
7 0

Answer:

4,5*6,02*10^23

Explanation:

The moles seem always complex topic but not in fact,

Consider that

1 mole of apple is 1 * 6,02*10^23

Same as 1 dozen of apple is 1 * 12

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Will medal!!!
hjlf
Δ H reaction = q / n where q: amount of heat released and n is number of moles of substance.
q = m . C . ΔT where:
m = mass of substance (g)
C = Specific heat capacity (4.18)
ΔT = change in temperature = 24.25 - 23.16 = 1.09
q = 1000 x 4.18 x 1.09 = 4556 J = 4.556 kJ
number of moles (n) = Molarity (M) x Volume (L)
                                 = 0.185 M x 0.07 L = 0.01295 mole
Δ H = q / n = - (4.556 kJ / 0.01295 mole) = -351.8 kJ / mol
Note: it is exothermic reaction (-ve sign)  i.e. temperature is raised

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