Chem 2 test 3 flashcards
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| A Sample of Helium gas at 745 torr and 45*C has a volume of of 80.0ml. What pressure is needed to Compress the volume of this sample at 35*C to half? |
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P1= 45 Torr T1= 318 K V1= .08 T2= 308K V2= .04
1.44 x 10^3 torr |
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| Calculate the number of grams of ammonia in a gas sample at 765 torr and 32*C if the volume is 76.5 ml? |
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n=PV RT
.0522 g NH3
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Given the reaction Ca(OH)2 + 2HCL --> CaCl2 + 2H2O
Calculate the molarity of the HCL solution if a 0.435 gram sample of Ca(OH)2 required 26.8mL of acid to reach the end point. |
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0.435g Ca(OH)2|1 mole Ca(OH)2|2mole HCL|.01174 74.08g|1mole CaCl2| 0.0268 L
3.15 x 10^-4m |
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| A gas has a molar mass of 48.0g/mole. Calculate the volume , in liters, of a sample weighing 3.67 grams, at STP |
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| please e-mail me |
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| How many grams of Sodium Chloride are needed to prepare 456 ml of a 10.2% solution? |
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10.2g|456.ml 100ml
46.5 g |
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| How many milliliters of 14M sulfuric acid are needed to prepare 2.50 L of 0.340M solution? |
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| How many grams of Potassium sulfate are contained in 450ml of 0.450M solution? |
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0.450M|.45L|174.06 K2SO4| L | |1 mole K2SO4 35.2 g of K2SO4 |
