33 a sample of a substance has these characteristics: • melting point or 9811 k
• hard. brittle solid at room temperature• poor conductor of heat and electricity as a solid
• good conductor of electricity as a liquid or in an aqueous solution
this sample is classified as(1) a metallic element
(2) a radioactive element(3) a molecular compound(4) an ionic compound

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

that tool would be a compass