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A weather balloon is filled with 120 L of helium at 15°C and a pressure of 0.80 atm. What is the volume of the balloon after it rises in the atmosphere to an altitude where the pressure is 0.10 atm and the temperature is -78°C?
Phenolphthalein has a pKa of 9.7. It is colorless in its acid form and pink in its basic form. For each of the pH's listed, calculate the ratio and predict the color
Problem- The empirical formula of a certain compound is CH2. If the molar mass of this compound is 56 g/mol, what is the molecular formula
A 75.0-mL volume of 0.200 NH3 is titrated with 0.500 M HNO3 . Calculate the pH after the addition of 19.0 mL of HNO3
When adding the solution of HNO3 from the buret in Step 14 to beaker 4, you know that you added 2.5 mL instead of 1.5 mL for a total volume of 11.0 mL. How would the calculated value of the equilibrium constant be affected for this sample?
Describe how the solid phase speciation (i.e., chemical form) of lead affects its bioaccessibility in the human digestive tract
the heat evolved when a mole of octane undergoes complete combustion is 1303 kcal. this is called the heat of
What is the pH when 100 mL of 0.1 M NH3 is titrated with 50 mL of 0.2 M HCl? pKa of NH4Br is 9.25.
Beginning with 150.0 mL of 0.175 M ammonia, determine the solution's pH after an additional 25.0 mL of 0.400 M ammonium chloride is added to the solution be sure to account for the change in volume at each step.
A buffer with a pH of 4.11 contains 0.29 M of sodium benzoate and 0.36 M of benzoic acid. What is the concentration of [H ] in the solution after the addition of 0.058 mol of HCl to a final volume of 1.6 L
a 670 ml gas sample at stp is compressed to a volume of 284 ml and the temperature is increased to 20 c. what is the
What mass of sodium hydroxide must be added to 75.0 mL of 0.205 M acetic acid in order to create a buffer with a pH of 4.74? acetic acid Ka=1.8x10^-5
what is the function of the baso4 solution as a traditional method of measuring a knife wound in a homicide victims
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