Multiple Choice
If a sample of sodium chloride, NaCl, contains 73.1 kg, what is its number of formula units?
6. Chemical Composition
Mole Concept
Back6. Chemical Composition
Mole Concept
- Multiple Choice
Calculate the number of oxygen atoms found in 783.9 g NiCl2 • 6 H2O.
- Multiple Choice
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.
- Multiple Choice
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)
- Multiple Choice
The density of the sun is 1.41 g/cm3 and its volume is 1.41 x 1027 m3. How many hydrogen molecules are in the sun if we assume all the mass is hydrogen gas?
- Open QuestionWhat is a mole?
- Open QuestionWhat is Avogadro's number?
- Open QuestionWhich weighs more, 5.00 g or 0.0225 mol of acetaminophen (C8H9O2)?
- Open QuestionCalculate the mass, in grams, for each of the following:e. 2.08 moles of (NH₄)₂SO₄
- Open QuestionCalculate the mass, in grams, for each of the following:d. 0.145 mole of C₂H₆O
- Open QuestionHow many NA+ ions are in a mole of Na2SO4? How many SO4 2- ions?
- Open QuestionHow many moles of ions are in 1.75 mol of K2SO4?
- Open QuestionCaffeine has the formula C8H10N4O2. If an average cup of coffee contains approximately 125 mg of caffeine, how many moles of caffeine are in one cup?
- Open QuestionFind the mass in atomic mass units of the following:a. 1 O atom, with a mass of 2.66 * 10^-23 gb. 1 Br atom, with a mass of 1.31 * 10^-22 g
- Open QuestionThe principal component of many kidney stones is calcium oxalate, CaC2O4. A kidney stone recovered from a typical patient contains 8.5 x 10^20 formula units of calcium oxalate. How many moles of CaC2O4 are present in this kidney stone? What is the mass of the kidney stone in grams?