Which of the following contains the smallest number of molecules. 1g H2O 1g NH3

Question

Which of the following contains the smallest number of molecules.
1g H2O 1g NH3 1g H2 1gO2 All are the same Chapter 5 Exercises (You may use a periodic table as needed.) I. If a single a single molecule of a substance weighs 7.64 x 1023 g, what is its molar mass I wile 2. W hich of the following contains the smallest number of molecules? A. 1.0 g H2O B. 1.0 g NH, C. 1.0 g H2 D. 1.0 g O2 E. all of the above are the same 3. Ethanol (C,H,OH) has a density of 0.789 g/ml. How many ethanol molec are in a teaspoon (5 mL) of ethanol? 4. 1023 atoms of zinc weigh nearly the same

Explanation / Answer

The one containging smallest no of molecules will have the smallest no of moles.

moles of H2O in 1g of H2O =

moles of H2O in 1g of H2O = 0.055

moles of NH3 in 1g of NH3 = 0.059

moles of H2 in 1g of H2 =0.5

moles of O2 in 1g of O2 = 0.031

As the no of molecules present in the above can be given by multiplying moles with Avogadro no,

O2 will have smallest no of molecules.

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