Avagadro's number says there are 6.02x1023 particles of a pure substance in one mole of that pure substance. (A particle is an atom, molecule, or ion.)
(2.1 mol CO2) (6.02x1023 molecules CO2/1 mol CO2)
= (2.1)( 6.02x1023 molecules CO2) = 1.26 x 1024 molecules CO2
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There are approximately 1.26 x 10^24 molecules in 2.1 mol of CO2. This is calculated by multiplying Avogadro's number (6.022 x 10^23) by the number of moles.
Each molecule of carbon dioxide (CO2) contains 1 carbon atom. Therefore, in 2.5 x 10^21 molecules of carbon dioxide, there are 2.5 x 10^21 carbon atoms.
To determine the mass of 21 mol of nitrogen (N), you need to know the molar mass of nitrogen, which is approximately 14.01 g/mol. Mass = Number of moles * Molar mass Mass = 21 mol * 14.01 g/mol = 294.21 g Therefore, the mass of 21 mol of nitrogen is approximately 294.21 grams.
There are approximately 5.84 x 10^21 carbon atoms in 9.7 x 10^-3 mol of carbon. This is calculated by multiplying Avogadro's number (6.022 x 10^23 atoms/mol) by the number of moles of carbon given.
molar mass NH3 = 17 g/molmolar mass SF6 = 146 g/molmolecules in 0.55g SF6 = 0.55g x 1mol/146g x 6.02x10^23 molecules/mole = 2.27x10^21 moleculesgrams NH3 needed = 2.27x10^21 molecules x 1mol/6.02x10^23 molecules x 17g/mol = 0.064 grams
The molecular formula for caffeine is C8H10N4O2. As can be seen each mole of caffeine contains TWO moles of O. Thus 3.5 moles caffeine x 2 moles O/mole caffeine = 7.0 moles oxygen