One mole is 6.02 × 1023 of anything.
One mole of atoms is 6.02 × 1023 atoms, one mole of rice is 6.02 × 1023 grains, one mole of shoes is 6.02 × 1023 shoes. You get the picture?
One mole of molecules is 6.02 × 1023molecules.
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There are approximately 6.022 x 10^23 molecules in one mole of CO2 gas. This number is known as Avogadro's number and represents the number of particles (atoms or molecules) in one mole of a substance.
6.02 ten to the power of 23
There are 0.022 moles of CO2 in a 1.76 g sample. Since there is a 1:2 ratio of O2 to CO2 in the compound, there are 0.044 moles of O2 present. This corresponds to 2.65 x 10^22 atoms of O2.
Use dimensional analysis to solve this problem. First calculate the molecular mass of CO2. This is found by (use a periodic table) adding 12.011g of C to (15.999g x2) grams of Oxygen. Once you do that, you find out that 44.009g are in 1 mole of CO2. Now, simply by looking at the equation of CO2, we can tell that 2 moles of oxygen atoms are in 1 mole of Co2 (look at the subscript for Oxygen). Now, your dimensional analysis should look like this: 254g CO2 x 1 mole CO2/44.009g CO2 x 2 mole Oxygen/1 mole CO2 The answer is 11.5 moles of Oxygen in 254g of CO2.
When 1 mole of C8H18 is burned, it forms 8 moles of CO2. Therefore, when 451 moles of C8H18 is burned, it will form 8 * 451 = 3608 moles of CO2.
Also 0,1 mole carbon dioxide.