Gas Law Math
How many moles of gas does it take to occupy 120.0 liters at a pressure of 2.3atm and a temperature of 340 K? R= 0.0821
9.9 moles
Gas molecules travel very slowly. True or false?
False, they are random and very fast
solute vs. solvent
what is dissolved into the larger amount
how do you find osmolarity
multiple number of ions in solution by the molarity
If something is saturated, what percentage of concentration is it?
100%
Find the new volume if the initial volume is 100 mL at a pressure of 780 mmHg and a final pressure of 1 atm.
102 mL
Gas molecules do not change structure with different temperatures. True or false?
True, still same molecule
colloid
when particles are suspended in the mixture. Examples- milk and jello
what do you need to find osmotic pressure?
number of ions, concentration, and temperature
Are nitrates soluble or insoluble?
soluble always
A dry gas has a pressure of 38.4kPa at 72.5°C. What will be the temperature of this gas at 80 kPa?
719.8 K
How do you convert between units of pressure?
760 torr= 760 mmHg = 1 atm
dilution
molarity becomes less concentrated with added volume or more concentrated with decreased volume
What is the percent solution (by volume) when 50. mL of ethanol is diluted to 140 mL with water?
36%
precipitate
insoluble stuff leftover after an aqueous reaction
Find the initial volume of the initial pressure is 74.0 kPa and the initial temperature is 55°C. The final volume is 153 mL, the final pressure is 745 mmHg and the final temperature is 19°C.
230.62 mL
What gas law do you use when the problem involves stoichiometry?
ideal gas law
solubility limit and supersaturated
the max amount of solute that can dissolve in solvent. Over this is supersaturated
What is the molarity of a solution containing 325 g of NaCl dissolved in 750. mL of solution?
7.4 M NaCl
what is insoluble here?
SrBr2 (aq) + Na2CO3 (aq) --> SrCO3 + 2 NaBr
SrCO3
Find the number of grams of hydrogen sulfide gas in a 3.6 L container at 32 degrees C and 712 mmHg.
4.6 g
What is STP?
standard temperature and pressure
293 K, 1 atm
spectator ion
an ion that is soluble in aqueous solution that does not participate in the reaction
How many grams of beryllium chloride are needed to make 125 mL of a 0.050 M solution?
0.5 g
what are the spectator ions here?
SrBr2 (aq) + Na2CO3 (aq) --> SrCO3 + 2 NaBr
sodium and bromide