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a) You detect a sound level of 97 dB when you are 3m from a sound source. Calculate the power of the source. Assume it emits sound in all directions uniformly.
b) How far do you need to be from the source so that you can barely hear any sound?
c) How much energy goes into your ear in 4 seconds when you are 2 m from the source? Assume that the radius of the opening into your ear is 0.4 cm.
if 2.50 mol of copper ii and 5.50 mol of silver nitrate are available to react by single replacement. what is the
What effect does the presence of lone-pair electrons have on the bond angles and the geometry of a molecule?
question a 9 aqueous solution of nitromethane can be readily prepared. which of the following accounts for
Magnesium hydroxide is used in several antacid formulations. When it is added to water it dissociates into magnesium and hydroxide ions. Mg(OH)2(s) Mg2+(aq) + 2OH-(aq).
Calculate the enthalpy of solution of Na2SO4 in water at this concentration. Compare your result with that calculated using data tables.
Find the standard reduction potentials for the following half reactions in acidic solution. E° for MnO4 (aq) + 8 H+ (aq) + 5e^- -> Mn^2+ (aq) + 4 H2O (I)
What is the pH at the stoichiometric point (end point) for the titration of 50 ml of 0.20 M methyl amine CH3NH2 (aq) with 0.20 M perchloric acid HClO4(aq)? For methyl amine (CH3NH2), Kb = 3.6 x 10^-4.
How many liters of oxygen gas must be added at constant temperature and pressure if you need a total of 1.72 mol of oxygen gas in the vessel
When a sample of neon with a volume of 628 mL and a pressure
How many molecules of ethanol C2H5OH are present in 135 g of ethanol? The density of ethanol is 0.789 g/cm3?
Determine how many grams of Ammonia are needed to produce 130 grams of hydrogen flouride?
What is the molarity of solution when .8292 grams of Nickel
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