<span>The total heat released, Q, equals number of moles, n, times molar heat of fussion, Hf. this is: Q = n * Hf. You kno Q and Hf, so you can find n as n = Q/Hf = 235.0 kJ / 12.55 kJ/mol = 18.72 mol. Now you can pass that to mass using the atomic mass of Au, which is 197 g/mol => mass = 18.73 mol * 197 g/mol = 3688.9 grams.</span>
The density is 19.4 g/ml the units could also be 19.4 g/cm^3
Answer:
The false statement is: d. Reactions with positive standard reduction potentials are oxidation reactions
Explanation:
Reduction potential, also called Redox potential of a species, suggests the ability of a given species to get oxidized or reduced by losing or gaining electrons.
A species with greater or more positive standard reduction potential has a greater tendency to get reduced. <u>Thus </u><u>reduction half cell reactions </u><u>have a positive standard reduction potential.</u>
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The <u>standard redox potentials for the half reactions</u> of various chemical species are given in a<u> tabular form</u> and can be determined by using a reference standard hydrogen electrode (SHE), having a fixed standard electrode potential (E₀) of 0 volts.
<u>The half cell reaction for SHE:</u> 2 H⁺(aq) + 2 e⁻ → H₂(g)
The half cell standard potential (E₀) can be used to calculate the change in the standard Gibb's free energy (ΔG°), by the equation:
ΔG° = - n.F.E₀
Answer:49.3
Explanation:4.1j/g c * 25g * (t2-45c)=455j
T2-45c = 455j/4.1j/g c * 25g
455/104.6
45+4.3= 49.3 celsius
