A sample of carbon dioxide gas collected at a pressure of 0.611 atm and a temperature of 300. K is found to occupy a volume of 868 mL. How many Moles of CO2 gas are in the sample? ___ mol

0.02mol

Explanation:

Given parameters:

Pressure  = 0.611atm

Temperature  = 300K

Volume  = 868mL  = 0.868L

Unknown:

Number of moles of CO₂   = ?

Solution:

To solve this problem, we use the ideal gas law:

  PV  = nRT

P is the pressure

V is the volume

n is the number of moles

R is the gas constant  = 0.082atmdm³mol⁻¹K⁻¹  

T is the temperature

     n  =   =    = 0.02mol

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.