General Chemistry Answers

H₂(g) + Cl₂(g)  2 HCl(g) + 185 kJ

Complete the thermochemical equation in ΔH_rxn format, for the reaction above.

H₂(g) + Cl₂(g)  2 HCl(g)     

 ΔH_rxn =  --------------------kJ

2 CaCO₃(s) + 2414 kJ  2 Ca(s) + 2 C(s) + 3 O₂(s)

Complete the thermochemical equation in ΔH_rxn format, for the reaction above.

2 CaCO₃(s) + 2414 kJ  2 Ca(s) + 2 C(s) + 3 O₂(s)     

ΔH_rxn =  --------kJ

Calculate the heat produced when 0.170 moles of boric acid, H₃BO₃ is produced.

B₂H₆ (g) + 6H₂O(l) → 2H₃BO₃(s) + 6H₂(g) + 184 kJ

If carbon monoxide gas effuses at 882 m/s, given the same conditions, what is the speed of effusion

for water vapor?

11.  A gas storage tank as a volume of 4.5x10⁵ m³ at 29 °C and 101.3 kPa.  What is the new volume in cubic meters of the tank if the temperature drops to -15 °C and the pressure drops to 86 kPa? 

Calculate the boiling poiny of a 0.44 m aqueous I solution of AlCl3

A nonionizing solid dissolved in water change the freezing point to -2.79°C calculate its concentration.

The metal rhenium (Re) was predicted to exist by Dmitri Mendeleev but was not discovered until 1925. Rhenium is composed of two isotopes, Re-185 (mass 184.95 amu) and Re-187 (mass 186.96 amu). Given that the average atomic mass rhenium is 186.21 u, calculate the percent abundance of each of these isotopes.  Show a full solution and round the final answer to 1 decimal place. 

The mass in g. in 0.79 mol of water (H₂O) (Hint: m=n X M)

Copper sulphate solution is electolysed using platinum electrodes A. current of 0.193 amperes is passed for 3hrs. How many grams of copper are deposited? (cu = 63.5, F = 96500 coulombs)