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Calculate the mass of unknown solid required to prepare 100 mL of a solution that is 100 ppm in Ca by assuming that the sample contains 50 wt% CaCO3.
Calculate the mass of CaCO3 required to prepare 500 mL of a standard solution that is 100 ppm in Ca2+.
Calculate the mass of NaCl required to prepare 500 mL of a standard solution that is 100 ppm in Na+
The daily energy requirement for an active adult human is around 2500 calories per day. A nutritional calorie is equal to 4.2 kJ of energy. If each ATP contains -30 kJ/mol under standard conditions, how many molecules of ATP does the body require ..
A solution of H2SO4(aq) with a molal concentration of 3.58 m has a density of 1.200 g/mL. What is the molar concentration of this solution
In a gas mixture, the partial pressures are argon 455 , neon 85 , and nitrogen 135 .What is the total pressure exerted by the gas mixture?
Calculate the molality of a 0.055 M solution of ethyl alcohol of in water at 25 C. (Assume the density of the solution at such low concentration is equal to that of water at 25C, 0.997 g/mL.
Calculate the pH of a sodium cyanide solution that is 0.37M NaCN. The Ka for hydrocyanic acid HCN is 4.00E-10.
Looking at the effect of ionic strength on activity coefficients, why would the initial slope for Ca2+ be steeper than that of K+
Calculate the potential of the cell be if the mass of the Iron (Fe) electrode (MW = 55.85 g/mol) is 62.0 g?
How much heat (in kJ) is evolved in converting 1.20 mol of steam at 134.0°C to ice at -55.0°C.
The pH of 0.750 M sodium hypochlorite, NaClO, is 10.72. What is the pKb for this base?
Calculate the pH of a solution that is 0.25M pyridine, C5H5N and 0.75M in pyridinium bromide, C5NHBr. (Kb for C5H5N= 1.7 * 10^-9)
what is the formula for the ionic compounds formed by magnesium ions and calcium ions with nitrate ions?
CO2 properties: appearance, reaction with limewater, reaction with flame, behavior with water. If positive observation then write a balanced equation.
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