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10,875 solutions

Mole Concept

Q. What is the mass of 2.00x1023 formula units of magnesium hydroxide?

Solved • May 8, 2019

Thermochemical Equation

Q. Charcoal is primarily carbon. What mass of CO2 is produced if you burn enough carbon (in the form of charcoal) to produce 5.30 × 102 kJ of heat? C(s) + O2(g) → CO2(g), ΔH˚rxn = − 393.5kJ

Solved • May 7, 2019

Gibbs Free Energy

Q. Calculate the entropy, Sº, per mole of O2(g).

Solved • May 7, 2019

Thermochemical Equation

Q. Nitromethane (CH3NO2) burns in air to produce heat. How much heat is produced by the reaction of 6.19 kg of nitromethane? 2 CH3NO2(l) + 3/2 O2(g) → 2 CO2(g) + 3 H2O(l) + N2(g) ΔH˚rxn = –1418 kJ

Solved • May 7, 2019

Entropy

Q. Without doing a calculation, predict whether the entropy change will be positive or negative when each of the following reactions occurs in the direction it is written:

Solved • May 7, 2019

Gibbs Free Energy

Q. Calculate the first ionization constant, K1, at 25°C for phosphoric acid: H3PO4(aq) → H+(aq) + H2PO4–(aq)

Solved • May 7, 2019

Gibbs Free Energy

Q. On the basis of 𝚫Gº for each of the following reactions, decide whether the reaction is spontaneous or nonspontaneous as written.

Solved • May 7, 2019