The mole is an SI unit representing a specific quantity of atoms of an element or molecules of a compound. There are 6.02 x 1023 atoms in a mole of an element or 6.02 x 1023 molecules in a compound. 6.02 x 1023 is known as Avogadro's number.
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Chlorophyll, it is chlorophyll
1) Chemical equation:
2Ca + O2 ---> 2CaO
2) molar ratios
2 mol Ca : 1 mol O2 : 2 mol CaO
3) Convert 35.4 g of Ca to moles:
number of moles = mass in grams / atomic mass = 35.4 g / 40.078 g/mol = 0.883 mol
3) use proportion and solve for x:
2 mol Ca / 1 mol O2 = 0.883 mol Ca / x
=> x = 0.883 mol Ca * 1 mol O2 / 2 mol Ca
=> x = 0.4416 mol O2
3) use ideal gases equation to transform moles to liters
pV = nRT => V = nRT / p =
V = [0.4416 mol * 0.0821 atm*liter / atm*K * 285K] / 1.2 atm = 8.6 liter
Answer: 8.6 liters
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