A scientist has two cubes, A and B, that are made of unknown substances. Both cubes have a mass of 15g. Cube A has a volume of 35 cm^3 and cube B has a volume of 70 cm^3. Explain how you know which cube has a greater density.

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Cube A

Explanation:

IF MASS IS SAME , THE CUBE WITH SMALLER VOLUME HAS A GREATER DENSITY

IN THIS CASE , CUBE A HAS LESS VOLUME SO GREATER DENSITY

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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 :