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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 compound is constituted by mass of 22.6% phosphorus, the rest being chlorine. Given that a volume of 307 mL of the gas has a mass of 1.55 g at 25 °C and 90 kPa, find the molecular formula for this compound
Calculate mass, mole fraction and avg. molecular weight of air, Calculate the constituent (a) mass, (b) mole fraction (c)average molecular weight of air at 25 degree centigrade, 1 atm, and molar density of all listed gases
Butane (C4H10) reacts with oxygen in the air to from carbon dioxide and water. how many moles of carbon dioxide can be formed from 1.25 mol of butane and excess oxygen?
0,245g of the carbonate was found to exactly neutralise 23,6cm3 of HCl with a concentration of 0,150 mol/dm3.
Estimate the molar heat of vaporization of a liquid whose vapor pressure doubles when the temperature is raised from 85ºC to 95ºC.
What it the chemical reaction between silver ion and excess ammonia.
The density of a gaseous compound was found to be 1.23 g L-1 at 330 K and 25.5 kPa. What is the molar mass of the compound?
Draw the products(if any) expected from the treatment of each of the following compounds with ozone followed by aqueous hydrogen peroxide
How much HCl is leftover after the 20.0 mol of HCl reacts with the 12.5 mol of NaOH?
Calculate the oxidation number of the chlorine in perchloric acid, HClO4.
how many milliliters of 0.54M HCL solution are needed to react completely with 4.6g of zinc to form zinc (II) chloride?
How many moles of KMnO4 are present in 25.0 mL of a 0.0900 M solution?
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