Inorganic Chemistry Answers

when 2.76 g (0.02 mol) of kco was added to 30,0 cm3 of app 2 mol dm-3 HCl the temperature rose by 5.2 degrees celcius. write a balanced equation, calculate the enthalpy change of this reaction per mole of k2co3. the specific heat capacities of solution are 4.2Jg-1k-1 and all solutions have a density of 1.0 gcm-3

Tarnishing of silver is caused by small amounts of hydrogen sulfide released into the atmosphere by decaying organic material and volcanic activity. According to the following equation:

 4Ag(s) + 2H₂S(g) + O₂(g) → 2Ag₂S(s) + 2H₂(l)

How many grams of Ag₂S can be produced from 1.70g H₂S if sufficient amount of the other reactants are present?

A sample, KOH, K2CO3, dissolved in water (35cm3). Its solution was titrated with 1.058moldm-3 HCl requiring 17.7cm3 to make it colourless due to phenolphthalein solution. After adding methyl orange, the solution consumed further 6cm3 of the acid to complete the neutralisation. What is the concentration of the sample?

An alkaline sample of sodium compounds (NaOH, Na2CO3) was dissolved in water 25cm3, was titrated with 1.058moldm-3 H2SO4 at 6.8cm3 to make it the solution colourless after phenolphthalein was added. After adding methyl orange a further 16.5cm3 more of the acid were needed to complete the analysis. What is the concentration of both?

Calculate the Qsp for the mixing of 30.0mL of 3.7 × 10^-3 M Sr(NO3)2 and 25.0mL of 0.02 M Na2SO4

5mol of a mixture of CH4 and C2H6 requires exactly 358.4L of oxygen for complete combustion, determine the percentage of methane in the mixture (GMV =22.4,dm³ at s.t.p

Known H2CO3: = 4.30×10-7, = 5.61×10-11, the pH of 0.1mol·L-1 sodium bicarbonate solution is ?

Which of these metals in the elemental state are stable (do not oxidise) in an aqueous solution at pH = 4.2 ? (3 marks)

Nickel: Ni2+ +2e- → Ni E0 = - 0.260 V

Copper Cu2+ + 2e- → Cu E0 = + 0.340 V

what is the geometry around each central atom in dimethyl fumarate

What's the polarity of Carbamylcholine?