What is the mass of 18.8 moles of helium (he) atoms

Answer : The mass of 18.8 moles of helium atoms are, 75.2 grams

Explanation : Given,

Moles of helium atom = 18.8 moles

Molar mass of helium atom = 4 g/mole

Formula used :

Now put all the given values in this formula, we get the mass of helium atom.

Therefore, the mass of 18.8 moles of helium atoms are, 75.2 grams

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

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 :