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The population mean of the bulb lifetime is 950 h and the population standard deviation is 50 h. calculate the fraction of bulbs expected to have a lifetime less than 800h and between 850 and 1000h
What is the pH of a solution which results from mixing 150 mL of 0.50M acetic acid and 150 mL of 0.50M sodium hydroxide at 25oC?
C5H12O, a gasoline additive used to boost octane ratings, has a standard heat of formation of -313.6kJ/mol. write a balanced equation for its combustion reaction, and calculate its standard heat of combustion in Kilojoules
A reaction mixture containing 20 mM O-acetyl serine, 50 mM NaCl, 50 mM HEPES buffer (pH 7.6), and O-acetyl serine acetylase is incubated in 37C until O-acetyl serine is completely hydrolyzed.
CaC2(s) + 2H2O(l) = C2H2(g) + Ca(OH)2(aq) . If 34 g of CaC2 are consumed in this reaction, how much H2O is needed?
Calculate the volume of carbon dioxide formed at a pressure of 2.50 atm and a temperature of 1250C.
Lithium iodide has a lattice energy of -7.3 times 10^2kJmol and a heat of hydration of -793kj/mol. Find the heat of solution for lithium iodide.
Calculate the pH of a buffer solution (consisting of 30mL 1.0M NaA + 30mL 1.0M HA and a pH of 4.75) mixed with 2mL of 1.0M NaOH. (In class we got a calculated pH of 4.63 for the mixture of the buffer solution with 2mL 1.
if the partial pressure of cyclopropane in the misture is 330 mm Hg and the partial pressure of the ocygen is 1.0 atm, what is the total pressure of the misture in torr?
1) Suggest a reason why the starting material (trans-1,4-diphenyl-2-butene-1,4-dione) should be recrystallized prior to use in the photochemical isomerization of an alkene.
Which solution will have the lowest boiling point?
Calculate the theoretical yield of when 114 g of C2H6 reacts with 206g of Cl2 , assuming that and react only to form and .
Conjugate Pairs of Acids and Bases, What is the base if the acid is H2PO4- and the equation of the pair?
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