Science Homework
*Deduce the number of molecules of
the following compounds in the given
quantities.
32g oxygen, 90g water, 8.8g carbon dioxide
oxide, 7.1g chlorine, 66g carbon dioxide, 35g Hydrochloric acid, 90g Sodium chloride, 45g Sodium hydroxide
Answers
Answer:
a. 32 g of oxygen
Number of moles in O2 =
Mass of O2 in gramsMolecular mass of O2
=
3232 = 1 mol
1 mole of O2 contains 6.022 x 1023 molecules
b. 90 g of water
Number of moles in water =
Mass of water in gramsMolecular mass of water
=
9018 = 5 moles
5 moles of H2O contains-----5 x 6.022 x 1023 molecules = 30.11 x 1023 molecules
C. 8.8 g of CO2
Number of moles in CO2 =
Mass of CO2in gramsMolecular mass of CO2
=
8.844=0.2 mol
0.2 moles of CO2 contains-----0.2 x 6.022 x 1023 molecules = 1.2044 x 1023 molecules
d. 7.1 g of chlorine
No. of moles in chlorine =
Mass of chlorine in gramsMolecular mass of chlorine
=
7.171=0.1 mol
0.1 moles of Cl2 contains-----0.1 x 6.022 x 1023 molecules = 0.6022 x 1023 molecules
Explanation:
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