Molarity
Another name for molarity
concentration
What is Avogadro's number
6.02 x 1023
The percent composition for HCl
3% hydrogen
97% chlorine
What's the meaning of the letters in the ideal gas equation?
answers
Group 17 elements are these.
What are Halogens?
unit to measure molarity
Molar (M)
What is the molality of a solution in which 25 grams of NaCl is dissolved in 2 kilograms of water?
Determine the molality of a solution of 5 moles of NaCl in 620 g of water.
0.065 m
Percent composition for N2S2
30.4% nitrogen
69.6% sulfur
State the units used to measure each of the letters in PV=nRT
answers
0.00600 has how many sigfigs?
3
What is the molarity of 500 mL of solution made from 0.70 moles of LiCl and water?
1.4 M
What is the molality of a solution in which 25 grams of NaCl is dissolved in 2 kilograms of water?
0.22 molal
Percent composition of KMnO4
25% potassium'
35% manganese
40% oxygen
Is the gas constant always 0.0821? Or is the constant different for other units? Explain
If using mmHg, the constant is 62.36 and if using kilopascals the constant is 8.31
Ca2+ has how many electrons?
18
What volume of a 1.40 M solution of H2SO4 contains 0.400 moles of H2SO4?
0.286 L
What is the molality of a solution in which 15 grams of I2 (iodine) is dissolved in 500 grams of alcohol?
0.12 m
What percent of sodium is in sodium hydroxide?
57.48%
How many moles of gas (air) are in the lungs of an adult with a lung capacity of 3.9 L? Assume that the lungs are at 1.00 atm pressure and at a body temperature of 40 o C.
0.15 mol
How do you convert liters to moles for a gas at STP
divide the liters by 22.4 to get the moles
What mass of K3PO4 is needed to make 4.00 L of a 1.50 M solution?
1,270 grams
What is the formula for molality? (Needs to be specific)
moles of solute divided by kilograms of solvent
The percent of nitrogen in ammonium sulfide is ___
41.1%
Calculate the volume occupied by 0.921 moles of nitrogen gas (N2) at a pressure of 1.38 atm and a temperature of 316 K.
17.3 L
Name any metalloid name
answers will vary
What mass of CH3OH is needed to prepare 1.50 L of a 3.00 M solution?
144 grams
How many grams of I2 (iodine) should be added to 750 grams of CCl4 to prepare a 0.020 m
3.81 g
Water is 89% oxygen. What's the quickest way to get the percent of hydrogen?
100-89 = 11%
A piece of dry ice (solid carbon dioxide) with a mass of 30 g sublimes (solid to gas) into a large balloon. Assuming that all of the carbon dioxide ends up in the balloon, what is the volume of the balloon at a temperature of 22 o C and a pressure of 745 mmHg?
16.8 L
The formula for aluminum phosphate is
AlPO4
I have two solutions. In the first solution, 1 mole of sodium chloride is dissolved to make 1 liter of solution. In the second one, 1 mole of sodium chloride is added to 1 liter of water. Is the molarity of each solution the same? Explain
listen to the explanation
Compare and contrast molarity and molality. How are they different? How are they similar?
answers will vary
Find the percent composition for sodium phosphate
42.1% Na
18.9% P
39% O
A sample of gas has a mass of 0.501 g. Its volume is 0.425 L at a temperature of 110 o C and a pressure of 1120 mmHg. Find its molar mass. (Hint: Molar mass is defined as grams per moles).
25.2 grams is the molar mass (25.2 g/mol)
The Bohr diagram of a "Sodium ion" is...
see the diagram