Inorganic Chemistry Answers

Caffeine is a stimulant found in coffee and has chemical formula C8H10N4O2 . A 100g sample of coffee powder contains 980 mg caffeine. Determine %nitrogen in 42.0 g of coffee powder

coal sample has the following composition by weight C =70 %, H

=10 %, O = 12%, S =5 %, N = 3 %. Calculate the gross and net calorific

value using Dulong’s formula.

A solution of HCl is known to be 0.5622 N. When titrated against KOH, 45.22 ml of the acid neutralized 48.23 ml of the base. Calculate the N of the base.

What is the molality of para-dichlorobenzene in a solution prepared by dissolving 2.65g C6H4Cl2 in 50.0 mL of benzene (d=0.897g/mL)?

how many ml of soln are required to prepare 0.02 mol of 2.5m Nacl soln?

A 3.00 g sample of TNT (trinitrotoluene, C7H5N3O6) is placed 

in a bomb calorimeter with a heat capacity of 1.93 kJ/°C; the 

ΔHcomb of TNT is −3403.5 kJ/mol. If the initial temperature of 

the calorimeter is 19.8°C, what will be the final temperature of 

the calorimeter after the combustion reaction (assuming no heat 

is lost to the surroundings)

Calculate for the specific heat of 28.0 g of of mercury (Hg)

when 137 J of energy is involved when raised at an initial

temperature of 22.0°C to a final temperature of 57. 0C.

Derive an expression for the entrophy change for isothermal mixing of ideal gas

a. A solution of HCl is known to be 0.5622 N. When titrated against KOH, 45.22 ml of the acid neutralized 48.23 ml of the base. Calculate the N of the base.1.    A solution of HCl is known to be 0.5622 N. When titrated against KOH, 45.22 ml of the acid neutralized 48.23 ml of the base. Calculate the N of the base.

b. What is the N of the solution of KOH if 45.18 ml are required to neutralize 0.3000 g of pure oxalic acid dehydrate (H₂C₂O₄°2H₂O)?

Hint: N x ml = g/MW/no. of H⁺ or OH^- or +cation x 1000 

where N x ml = no. of milliequivalent weight and g/MW/no. of H⁺ or OH^- or +cation x 1000 = no. of milliequivalent weight

A 0.00453 L of sodium chloride solution was needed in a 560 mg sample that assayed

87.1% (w/w) Na2SO4. Calculate the molar concentration of sodium chloride in the

solution.