Physical Chemistry Answers

The cathodic reaction of a dry cell is represented by 2MnO2(s) + Zn2+ + 2e- → ZnMn2O4(s) If, there are 8 g of MnO2 in the cathodic compartment then the time for which the dry cell will continue to give a current of 2 milliampere is:

A gaseous oxide contains 30.4% nitrogen, 1 molecule of which have 1 atom of nitrogen. What is the density of oxide relative to oxygen?

The decomposition of ammonium carbamate takes place according to
NH2COONH4(s) <--> 2NH3(g) + CO2(g), Show that if all NH3 and CO2 results from the decomposition of NH2COONH4, Kp = (4/27)P3, where P is total pressure in equilbrium.

A sample of oxygen occupies a volume of 325 mL at 35oC. What volume will it occupy at 85 oC?

A sample of nitrogen occupies a volume of 275 mL at 25 oC. What volume will it occupy at 85 oC?

A 20mL portion of 40% NaOH solution is diluted to 200mL with water. What is the percent of the NaOH after dilution?

2.013 g of a commercial sample of NaOH containing sodium carbonate as an impurity was dissolved to give 250 ml solution. A 10 ml portion of this solution required 20 ml of 0.1 N sulphuric acid for complete nuetralisation. Calculate % by weight of sodium carbonate.

What quantity of energy is required to vaporize 25 moles of water that is at 100 degrees celcius

What quantity of heat energy is required to melt 25 moles of ice that is at 0 degrees celcius

the potential of hydrogen electrode at pH=10 at 25 degree Celsius is