What is the number of moles of CO2 in a 220.-gram sample of CO2 (gram-formula mass = 44 g/mol)?
1. 0.20 mol
2. 5.0 mol
3. 15 mol
4. 44 mol

the answer is 5.0moles of CO2

Explanation:

if you have done conversion of moles to grams and vice versa

then this might be easy but this should help:

so if you have grams you just divide the given mass by the formula mass.

ie 220g CO2/44 g/mol= 5.0moles

ps i hope this helps

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.