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Calculate the ∆H for the reaction:
CS2 + 2 O2 CO2 + 2 SO2
Given:
∆Hf CO2 = -393.5 kJ/mol
∆Hf SO2 = -296.8 kJ/mol
∆Hf CS2 = 87.9 kJ/mol
A is an aqueous solution of H2SO4 of concentration 0.05 moldm3,B is put A intoa burette pipette 25cm3 of B into a conical flask and add two drops of methyl orange indicator
What is the concentration in moldm3 of NaOH in B given the equation for reaction H2SO4+2NaOH
What is the percentage purity of the NaOH
What is the percentage of the impurity present
1. 19.0g of aluminum reacts with 21.0 grams of chlorine gas to produce aluminum chloride. Which reactant is limiting, which is in excess?
2 Al + 3 Cl2 à 2 AlCl3
Give the given, unknown and full solution
1. What mass of calcium sulfate can be produced from the reaction of 1250 g calcium phosphate with 750 g H2SO4?
Ca3(PO4) 2 (s) + H2SO4(aq) à CaSO4(s) + H3PO4(aq)
Give the given, unknown and full solution.
solution containing the complex formed between bi( iii) and thiourea has a molar absorptivity of 9.32 x 103 l mol-1 cm at 470 nm_ (a) what is the absorbance of a 6.24xl0 5 m solution of the complex at 470 nm in a 1.00 cm cell? (b) what is the percent transmittance of the solution described in (a)? (c) what is the molar concentration of the complex in solution that has the absorbance described in
How many valence electrons are found in this element with a configuration of 1s2 2s2 2p6 3s2 3p5?
The decomposition of acetaldehyde in gas phase was studied at 729k using the initial concentration of 7.77×10^-3M and 3.64×10^-3M. The half life periods were determined to be 295s and 515s respectively. Determine the order of the reaction.
what property of water
A 1.00 mol sample of gas at 25 °C and 1.0 atm has an initial volume of 22.4 L. Calculate the results of each change, assuming all the other conditions remain constant.
b. The volume is reduced to 275 mL. What is the pressure in millimeters of mercury
Enzymes catalyze the degradation of biomolecules, like starch and cellulose, into simple sugar glucose. Why do you think can humans digest starch but not cellulose?
