Calculate the mass, in kilograms, of an object that occupies 0.253 dm3 and has a density of 4.14 g/cm3.

m = 1.047 kg

Explanation:

Volume occupied by the object, V = 0.253 dm³

1 dm³ = 1000 cm³

0.253 dm³ = 253 cm³

Density of the object, d = 4.14 g/cm³

We need to find the mass of the object. Mass per unit volume is called density of an object.

or

m = 1.047 kg

So, the mass of the object is 1.047 kg.

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 :

no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.