2. Atoms & Elements
Mole Concept
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- 객관식
If a sample of sodium chloride, NaCl, contains 73.1 kg, what is its number of formula units?
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Calculate the number of oxygen atoms found in 783.9 g NiCl2 • 6 H2O.
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If the density of water is 1.00 g/mL at 25°C, calculate the number of water molecules found in 1.50 x 103 µL of water.
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A cylindrical copper wire is used for the fences around a house. The copper wire has a diameter of 0.0750 in. How many copper atoms are found in 5.160 cm piece? The density of copper is 8.96 g/cm3. (V = π • r2 • h)
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How many atoms of oxygen are in the chemical formula 2Ca(ClO2)2? 2, 4, 6, or 8?
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How many moles are there in 8.50 x 10^24 molecules of sodium sulfate, Na2SO3?
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How many moles are in 2.5 g of N2? 0.089 moles, 0.18 moles, 1.3 moles, 11 moles
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What is the number of moles of CO2 in a 220 gram sample of CO2?
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