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For which cation does fluoride ion have no masking effect? Al_Mo_Be_Fe
A reaction has a rate constant, k = 1.29 s-1. What is the half-life (seconds) when the initial concentration is 0.784 M?
Direction: Solve the following problems. Attach your solutions.
1. Calculate the standard enthalpy ∆H°, for the following reaction:
2CH3OH (l) + 3O2 (g) ---> 2CO2 (g) + 2H2) (g)
Given: CH3OH (l) ∆Hf° = - 238.7 kJ
CO2 (g) ∆Hf° = - 393.5 kJ
H2O (l) ∆Hf° = - 285.8 kJ
Essay.
Water, compared to other substances, has one of the highest specific heat values. What is the advantage of this fact for the human body?
1. Calculate the enthalpy change for the following chemical reaction:
CS2(1) + 3O2(g) ---> CO2(g) + 2SO2(g)
1.C(s) + O2(g) ---> CO2(g) ∆H° = - 393.5 kJ
2.S(s) + O2(g) ---> SO2(g) ∆H° = - 296.8 kJ
4.C(s) + 2S(s) ---> CS2(1) ∆H° = + 87.9 kJ
Calculate the ΔH of the following problems.
1. How many joules are required to raise the temperature of 450 mL of water from 30°C to 100°C?
2. The specific heat of copper metal is 0.385 J/g-°K. How many kJ of heat are needed to raise the temperature of 1.1 kg block of copper from 27.5°C to 50°C?
Suggest reasons why a glass electrode can be used for the determination of the pH of an aqueous solution
Find the partial pressure of carbon dioxide in a gas mixture with a total pressure
of 30.4 kPa if the partial pressures of the other two gases in the mixture are 16.5
kPa and 3.7 kPa.
Use the localised electron model to describe the bonding in hydrogen cyanide and phosgene(cocl2)
a sample of air, upon analysis by an environmentalist showed that it contains 1.4x 10 of mercury per 50 ml of solution, what is the mercury concentration in a ppm chemistry answer
The decomposition of PCl5 is shown below:
PCl5(g)⇌PCl(g) + Cl(2)
Kc 3 = 0.029 at 85°C
Find out if the reaction proceeds forward, backward, or if the system is at equilibrium when a 1 liter
container is filled with 0.4 mole PCl5, 0.5 mole PCl3, and 0.2 mole Cl2.
