Please help, it\'s due in a few hours. You may want to reference (pages 110) sec

Question

Please help, it's due in a few hours.

You may want to reference (pages 110) section 3.8 while completing this problem. Calculate the mass (in grams) of each sample. 4.7 times 10^25 O_3 molecules Express your answer to three significant figures and include the appropriate units. m_O_3 = 7.28 times 10^19 CCI_2 F_2 molecules Express your answer to three significant figures and include the appropriate units. m_CCll_2 F_2 = 3 water molecule(s) Express your answer to four significant figures and include the appropriate units. m_H_2 o =

Explanation / Answer

To calculate the ass of given samples convert them into moles first and then as we know mass of one mole that is molar mass , we calculate the mass.

number of moles = number of molecules / avogadro number

mass of sample = number of moles x molar mass

Part A

moles of O3 = 4.7 x 1025 / 6.023 x 1023

   = 78 moles

molar mass of O3 = 48g/mol

Thus mass of sample = 78mol x 48 g/mol

= 3745g

Part B

moles of CCl2F2 = 7.28x1019 /6.023x1023

= 1.20 x10-4

molar mass of CCl2F2 = 121 g/mol

Thus mass of sample = 1.2 x10-4 mol x 121 g/mol

=1.45 x10-2 g

=0.01452 g

Part C

moles of water = 3 /6.023 x 1023

= 4.98 x 10-24 moles

molar mass of wate = 18g/mol

mass of 3 molecules of water = 4.98 x 10-24 moles x 18 g/mol

= 8.964x10-23 g

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