General Chemistry Answers

3 Mn3O4(s)   +   8 Al(s)    →  4 Al2O3(s)   +   9 Mn(s)

How many manganese atoms are released if 54.8 moles of Mn3O4 react with excess aluminum.

Which of the statements is correct?

1.Carbon may form a polar or non-polar covalent bond.

2.A carbon-hydrogen bond ethane (CH3CH3) is highly polar.

3.In a carbon atom, the 2s and 2p orbitals are equal in energy.

4.Carbon has two valence electrons.

What is the pOH of a solution prepared by diluting 50ml of 0.06M HCl with 20ml of distilled water? *

Decomposition of carbonic acid (H₂CO₃) into water and carbon dioxide. will the sign be positive or negative?

Predict whether the entropy of the system where the following changes occur is expected to increase or decrease.

1. Melting of ice cream =

2. Sublimation of naphthalene at room temperature =

3. Heating a liquid from 20C°to 50C°=

4. Decomposition of carbonic acid (H^2CO^3)into water and CO^2=

5. KCIO^3(s) = KCI(s) + O₂(g) =

6. 2H^2(g) + 0^2(g) = 2H₂0 (g)=

7. 2S0^2(g) + 0^2(g) =2SO^3(g) =

8. NH^4CL(s)→ NH^3(g) + HCl(g)=

The decomposition of PCl5 is shown below:

PCl5(g)⇌ PCl3(g) + Cl2(g) Kc = 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.

A rock is thrown horizontally from a height of 88 m high with a horizontal speed of 25 m/s. WHAT IS THE FORMULA TO BE USED IN finding time?

Write the thermochemical equation for the following reactions that occur at constant temperature:

a) Decomposition of mercuric oxide, HgO, to mercury and oxygen gas, requires 87.1 kJ of heat

b) Combustion of hexane, C6H12, to carbon dioxide gas and water, releases 3923.9 kJ of heat

Find ΔΕ

a) When 175 kJ of work is done on a system that evolves 50 J of heat to the surroundings

b) When a gas absorbs 28 kJ and has 13 kJ of work done on it

B. Consider the following reaction in a container with a movable piston:

A_(I) + B_(I) = C_(g)

The ΔE for this reaction is 760 J. As the piston moves up, the system absorbs 839J of heat from its surroundings.

1. Is work done on the system?

2. How much work?