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A student collects 242mL oxygen in a gas collecting tube by water displacement. The water level inside the tube is 27.0mm higher than that ouside. The temperature is 294 K. The barometric pressure is 753 mmHg. What is the partial pressure of the dry gas at STP?
if a raindrop weighs 60. mg on average and 5.1 105 raindrops fall on a lawn every minute what mass in kg of rain falls
Calculate the standard reaction enthalpy for the following reaction. N2H4(l) + H2(g) -----> 2NH3(g) Given: N2H4(l) + O2(g) -------> N2 (g) + 2H2O(g)
An argon ion laser which operates at 488.2 nm is used to excite the tagged proteins and observe fluorescence. A 5 µM solution gives a signal of 0.852 relative fluorescence units. What is the wave number of the laser light at 488.2 nm?
bismuth oxide reacts with carbon to form bismuth metal:when 217g of Bi2O3 reacts with carbon, how many moles of Bi2O3 react?
Write a balance equation for each of the following reactions and identify the type of reaction: a) Solid potasium chlorate is heated to form solid potassium chloride and oxygen gas; b) Carbon monoxide gas and oxygen gas combine to form carbon diox..
assume you dissolve .297 g of the weak acid benzoic acid in enough water to make 105 ml of solution and then titrate
Briefly explain in terms of structure, basicity, and solubility why Novocain® is usually administered by injection whereas benzocaine is typically used in salves.
Calculate the change in enthalpy of this reaction. Specific heat of the solution = 4.184 J/(g oC) State your answer in kJ with 3 significant figures. Don't forget to enter the unit behind the numerical answer. The molecular weight of KOH is 56.2 g..
Acetic acid is a weak acid whose Ka is 1.8 X 10^-5. Calculate the predicted pH values for 1.0 M, 0.10 M, and 0.010 M acetic acid.
If a 1,2-diol is subjected to a periodic acid test, a white solid will form when silver nitrate is added. What is the identity of the white solid?
A sample of H2SO4 contains 1.11 grams of H (1.01 g/mol). How many moles of H2SO4 (98.02 g/mol) are present?
Draw a molecular orbital picture for the pi system of each reagent in the [3+2] cycloaddition reaction of ozone with an alkene. Be sure to label the homo and lumo of each.
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