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The recommended daily dietary intake of calcium for adult men and pre-menopausal women is 1100 mg/day Calcium citrate , Ca3(C6H5O7)2 What mass of calcium citrate would be needed to provide the recommended daily intake of calcium?
For phenylanaline can be modeled as particle on a ring. Calculate the probability of finding electrons in one half of the ring from the ground state
A procedural change would be essential if a boy want to determine the tomato juice's acidity by titrating a sample of juice with NaOH(sodium hydroxide) solution Briefly explain What change would you make to the procedure ?
If a copper-containing compound is found to be 29.2% Cu by mass, and there is only one copper atom per formula unit, what is the formula mass of the compound in amu?
A radioactive element has a half-life of 2.2 hours. How many hours will it take for the number of atoms present to decay to one-sixteenth of the initial value? Show your calculations please.
determine the pressure in a 125-L tank containing 56.2 kg of oxygen gas at 21.0 oC
three portions of the same liquid are mixed in a container that prevents the exchange of heat with the environment.
Write the balanced (i) molecular equation, and (ii) net ionic equation which show what happens when aqueous solutions of barium nitrate and potassium sulfate are mixed together. Identify the spectator ion(s) Is this correct
A sample of compound B having an unknown concentration is measured to have an absorbance of 0.90 in a 1.00 cm path length cell at 500 nm. What is the concentration of B in this sample, assuming Beer's Law holds
The specific heat capacity of solid copper metal is 0.385 J/g-K. How many joules of heat are needed to raise the temperature of a 1.55-kg block of copper from 33.0C to 77.5C?
Not all Friedel-Crafts reacts require a strong Lewis acid catalysts to generate the electrophile for the substitution reaction. Show, using curved arrows, how the electrophile is generated from t-butanol in the presence of H2SO4
The main reason that alkyl halies are good electrophiles is that: A) the carbon atom linked to the halogen is negatively polarized. B) the carbon atom linked to the halogen is positively polarized
How does solubility of polar and non-polar molecules in water set up cell membranes and disolve essential bio chemicals
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