4.18 L of oxygen, O2, at STP is how many molecules of O2?

1.12 × 10²³ molecules O₂

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

4.18 L O₂

Step 2: Identify Conversions

Avogadro's Number

STP - 22.4 L / mol

Step 3: Convert

= 1.12375 × 10²³ molecules O₂

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

1.12375 × 10²³ molecules O₂ ≈ 1.12 × 10²³ molecules O₂

i believe that it is a exoplanet

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 :