General Chemistry Answers

How many moles are in 50.4g of CaBr2

if 100cm of hydrogen is sparked with 40cm3 of oxygen to produce H2O at s.t.p, calculate the volume of the gas that is in excess

Assignment 1: Application of static fluid principles

10.A reservoir of carbon tetrachloride has a mass of 500Kg

and a volume of 0.315 m^3. Find:

a) Weight of carbon tetrachloride

b) Mass density of carbon tetrachloride

c) Specific weight of carbon tetrachloride

d) Specific gravity of carbon tetrachloride

 Use the localized electron model to describe the bonding in hydrogen cyanide and 

    Phosgene (COCl2).

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?

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)