Molarity
What is the molarity of a sodium hydroxide solution with 0.090 moles dissolved to make 0.80 liters of solution.
0.11 M NaOH
What is the molar mass of sodium?
22.99 g/mol
What is the formula of dinitrogen trioxide?
N2O3
How many moles are in 3.03 grams of silver?
0.0281 moles
mass/mole mass = 3.03/107.87 = 0.0281 moles
What is the molar volume of any gas at STP?
22.4 liters
What is the molarity of a sodium chloride solution containing 6.75 grams of solute in a total of volume of 0.452 L of solution?
0.256M NaCl
What is the molar mass of sodium carbonate?
105.99 g/mol
Na2CO3
22.99+22.99+12.01+16.00+16.00+16.00=105.99 g/mol
What is the name of P4O10?
tetraphosphorus decoxide
How many moles are contained in 8.20x1032 atoms of uranium?
1.36x109 moles U
atoms/Avogadro's number
8.20x1032/6.02x1023 = 1.36x109 moles (1,400,000,000 moles)
What is the volume of 7.50 moles of nitrogen gas at STP?
168 liters
If 25.0 ml of a 6.00M HCl solution is diluted to 125 ml, what is the new concentration?
1.20M HCl
V1M1 = V2M2
(25.0ml)(6.00M) = (125ml)(X)
How many atoms are contained in 0.11 moles of carbon?
6.6 x 1022 carbon atoms
moles x Avogadro's number
= 0.11 x 6.02x1023
= 6.6 x 1022 atoms
What is the name of Al2O3?
aluminum oxide
How many atoms are contained in 0.0321 grams of gold?
9.81x1019 atoms
grams/mole mass = moles
0.0321/196.97 = 1.62969x10-4 moles
moles x Avogadro's number = atoms
1.6337x10-4 x 6.022x1023 = 9.839x1019 atoms
Au = 196.97 g/mole
How many moles are in 888 mL of hydrogen gas at STP?
0.0396 moles
What volume (in milliliters) of a 0.966 M solution contains 0.0245 moles of solute?
25.4 mL
What is the mass of 3.62 moles of hydrogen gas?
7.31 grams H2
Hydrogen is diatomic: H2
moles x mole mass = 3.62 x 2.02 = 7.31 grams
What is the formula for ammonium phosphite?
(NH4)3PO3
What is the mass of 2.99x1023 formula units of sodium chloride?
29.0 grams
formula units/Avogadro's number = moles
2.99x1023/6.022x1023 = 0.497 moles
moles x mole mass = grams
0.497 x 58.44 = 29.0 grams
NaCl = 22.99+35.45=58.44 g/mole
What is the mass of 81.5 liters of carbon dioxide at STP?
160. grams
How many grams of sodium chloride are needed to make 230.0 mL of a 0.26M NaCl solution?
3.5 grams NaCl
What is the mass of 3.03 moles of ammonium carbonate?
291. grams (NH4)2CO3
moles x molar mass = 3.03 x 96.11 = 291 grams
(NH4)2CO3 = (2x14.01) + (8x1.01) + 12.01 + (3x16.00) = 96.11 g/mol
What is the name of Sn(C2H3O2)4?
tin(IV) acetate
How many molecules are found in 32.0 grams of dihydrogen monoxide?
1.07x1024 atoms
grams/mole mass = moles
32.0/18.02 = 1.8 moles
moles x Avogadro's number = atoms
1.7758 x 6.02x1023 = 1.07x1024 atoms
H2O = 1.01+1.01+16.00=18.02 g/mole
How many molecules are in 531 ml of sulfur trioxide gas at STP?
1.43x1022 molecules SO3