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Glucose is pumped into some animal cells by a symporter powered by simultaneous entry of Na+. The entry of Na+ provides a free-energy input of 10.8 kJ/mol under typical cellular conditions (external [Na+] = 143 mM, internal [Na+] =14 mM and a membrane potential = -50 mV). What is the ratio of glucose concentration outside and inside cells?
a buffer solution was made to have 1.4M HF and 1.10 M NaF. If .1 moles of NaOH are added to 1.00 L of the buffer, what will be the pH? Assume the volume remains constant. Ka of HF = 7.2E-4.
Mg3N2(s) + H2O(l) → Mg(OH)2(s) + NH3(g) If this process is 82% efficient, what mass of ammonia can be prepared from 22.0 kg magnesium nitride.
A researcher conducts an experiment to determine the work function of a palladium surface. She fires a laser with a wavelength of 254 nm at a certain time and observes electrons hitting a detector
When 64.5 g of HCl are allowed to react with 17.6 g of O2, 50.4 g of Cl2 are collected. Determine the limiting reactant, theoretical yield of Cl2 and percent yield for the reaction.
If 4.00 mL of vinegar needs 41.5 mL of 0.150 M NaOH to reach the equivalence point in a titration, how many grams of acetic acid are in a 1.80 qt sample of this vinegar?
A 335 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 628 mmHg. Calculate the moles of Ar present.
From the Mn concentrations (3.56ppm and 3.71ppm) and uncertainty
Calculate the molar solubility of barium fluoride in water at 25 degrees celsius. The sp constant for BaF2 at this temperature is 1.0x10^-6.
The mole fraction of potassium nitrate in an aqueous solution is .0194. The density of the the solution is 1.0627 g/mL. Calculate the molarity of the solution.
How much HCl is leftover after the 20.0 mol of HCl reacts with the 12.5 mol of NaOH?
Calculate the density of a block.
The resulting equilibrium solution has a pH of 10.56. What is the Ksp of the salt at 22 °C?
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