Multiple Choice
How many moles of sodium carbonate (Na2CO3) contain 1.773 × 10^17 carbon atoms?
2. Atoms & Elements
Mole Concept
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Which of the following has the smallest mass?
A
0.040 kg of Br2
B
255 g of Cl2
C
7.50 mol of F2
D
5.50 × 10^24 molecules of I2
Verified step by step guidance1
Convert the mass of Br2 from kilograms to grams: 0.040 kg = 40 g.
Calculate the molar mass of Cl2 by adding the atomic masses of two chlorine atoms. Use the periodic table to find the atomic mass of chlorine.
Calculate the mass of 7.50 mol of F2 by first determining the molar mass of F2 (using the atomic mass of fluorine) and then multiplying by the number of moles.
Determine the number of moles of I2 from the given number of molecules using Avogadro's number (6.022 × 10^23 molecules/mol), and then calculate the mass by multiplying the number of moles by the molar mass of I2.
Compare the masses of Br2, Cl2, F2, and I2 calculated in the previous steps to determine which one has the smallest mass.
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