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Your mom buys you a helium balloon at the circus. It has a volume of 4.00 liters at STP. What mass of helium (He), expressed in grams, does this balloon contain?
The heat required to raise the temperature of a large cup of water (for coffee) from room temperature to boiling is approximately 100 kJ. Express this quantity of heat in kilocalories and British thermal units.
Forty miles above the earth's surface, the temperature is 250 K and the pressure is 0.12 mm Hg. What is the density of air at that altitude. Assume the molar mass of air is 28.95 g/mol
Calculate the change in pH across the membrane that is required at 25C to synthesize one mole of ATP from ADP and Pi under standard state conditions. ?rG'=31.4kJ for the synthesis of 1 mole of ATP (mitochondrial ??=-0.15V)
Determine the molar mass of the acid and given that the pH at the half way point to the equivalence is 3.86. Calculate the Ka of the unknown acid.
Lead ions can be removed from solution by precipitation with sulfate ions. Suppose that a solution contains lead(II) nitrate. Write complete ionic equation to show the reaction of aqueous lead(II) nitrate with aqueous potassium sulfate to form sol..
When a 3.400 gram sample of an unknown alcohol is burned in oxygen, the products were carefully collected and weighed yielding 6.494 grams of CO2 and 3.985 grams of H2O. If the molecular weight of the unknown is 46.069 g/mol, what is the molecular ..
With reference to relevant clinical analytes, discuss the use of immunoassay within clinical biochemistry.
An aqueous solution contains the amino acid glycine. Assuming that the acid does not ionize in water, calculate the molality of the solution if it freezes at -1.1 degree centigrade.
Suppose you were to prepare a buffer solution using ammonia and ammonium chloride. What would be the molar ratio of acid to its conjugate when the pH was adjusted to each of these values. (Kb = 1.8 multiplied by 10-5) (a) pH = 10.19
Deduce from these data the corresponding equation and write the formulas for the oxide and sulfate of M. Using the smallest whole number coefficients write the balanced equation for the reaction of the metal M with hydrochloric acid.
Calculate the pH at each of the following points in the titration of 50 mL of 0.2000M acetic acid using 0.222M NaOH. Ka= 1.8 x 10^-5 (show work)
What is the final temperature of the water and aluminum assuming no heat was lost during the energy exchange.
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