General Chemistry Answers

How do you know a change is just a physical change? Give two examples changes.

Describe the optimum design parameters while using Aluminum and steel together, give practical examples to elaborate your answer?

A solution is made by dissolving 75.0 grams glycerin C3H803 (92 g/mol), in 600.0 grams of water (18 g/mol) to make approximately 600 -mL solution. Calculate the following:

a. Vapor pressure of the solution at 25.0 Celsius (The vapor pressure of pure water is 23.8 torr at 25.0 Celsius).

b. Boiling point of the solution

c. Freezing point of the solution

d. Osmotic pressure at 25.0 Celsius

What is Studies fundamental concepts

What volume of carbon (IV) oxide in dm 3 is produced at s.t.p. when 2.50g of CaCO3 reacts with excess acid according to the following equation? CaCO3(s) + 2HCI(aq) → CaCl2(aq) + H2O(1) + CO2(g)[CaCO2 100; molar volume of a gas at s.t.p. = 22.4dm 3]

2.95 g of chloroform, CHCl₃ (119.37 g.mol^-1), is placed in a closed 2.00 L flask at 90 ^oC which contains air whose pressure is 83.0 kPa. the chloroform vaporizes.

1. Calculate the partial pressure of chloroform.
2. Find the total pressure and mole fraction of the chloroform.

Consider the equilibrium reaction: 2NO (g) + O₂ (g) ⇌2NO₂ (g) Δ_rH = -114 kJ.mol^-1

1. With a gas mixture comprising of 20% mole each of NO and NO₂, the remainder being O₂, and K_p = 9.0 at 298 K.
2. Deduce the pressure at which the mixture is at equilibrium

The s and f sub-levels contain electrons for

How many grams of water can react with 7.30 moles of carbon dioxide

The surroundings do 1.44kJ of work compressing a gas in a perfectly insulated cylinder such that no heat can be exchanged. "Calculate the change in internal energy of the system and determine whether the process is endothermic or exothermic"