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Potassium metal reacts violently when added to water according to the balanced equation: 2K(s) + 2 H2O (I) > 2KOH(aq) + H2(g). How many moles of H2O are needed to react completely with 7.54 mol of K
Choose the selection which lists the following substances in order of increasing boiling point (lowest boiling substance listed first): CS2, N2, and CBr4 a) N2
A 30.0 mL sample of a diprotic acid is titrated with 0.255 M KOH. If 59.5 mL of base is required to reach the second equivalence point
The solubility of N2 in blood can be a serious problem (the "bends") for divers breathing compressed air (78% N2 by volume) at depths greater than 50 ft.
If you wanted to make a 3 liter solution of 500 mM formic acid buffer at pH 3.9 how many grams each of sodium formate (MW=68g/mol) and formic acid (MW=46g/mol) would you add
A solution made by dissolving 14.2 g of an unknown compound in 100.0 g of water has a freezing point of -0.771 °C. If the Kf for water is 1.86 °C/m
Given a concentration of 100 ppm in water, calculate the predicted equilibrium concentration concentration in air for methyl tertiary-butyl ether (MTBE)
The bond angles in H3O+ are:? a) slightly less than 109.5o b) exactly 109.5o c) slightly less than 90o d) exactly 90o
What is the empirical formula of a hydrocarbon which produces 2.703 g CO2 and 1.108 g H2O
Find the molecular mass of sucrose and determine how many molecules there are in 1kg of it.
what is the molarity of a solution prepared by combining 125mL of 0.251 molar HCl with 250mL of pure water
The freezing point of pure benzene is 5.5 Celsius and its freezing point constant is 5.12 C/m. Calculate the molecular weight of the unknown.
solid silicon and solid magnesium chloride form when silicon trichloride gas reacts with magnesium metal. write a word
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