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Gold is a face-centered cubic structure that has a unit cell edge length of 4.08Angstroms . There are four gold atoms per unit cell. How many gold atoms are there in a sphere that is 20nm in diameter? Recall that the volume of a sphere is (4/3) pi r^3
the combustion of octane produces carbon dioxide and water. if you start with 10.0 mol of octane what mass of water in
calculate the number of grams of iron and the number of grams of carbon dioxide formed
Calculate the mass and volume of 150.0 mmol of isopentyl alcohol and the theoretical yield of isopentyl acetate
Write a balanced equation for the reaction that occurs when hydrogen sulfate ion behaves as a Brønsted-Lowry acid in water.
Naphthalene is a hydrocarbon that is commonly found in mothballs. Naphthalene is 93.75% carbon by mas. If Naphthalene's molecular formula is twice its empirical formula , What the molar mass
Why do carboxylic acids (-COOH) compounds have higher boiling points than simple alkanes of the same molecular weight
a reaction has an activation energy of 123 kjmol and a rate constant of 0.200 s-1 at 311k. at what temperature will the
The standard cell potential for the electrochemical reaction is 1.10V. Calculate the cell potential if the concentration of zinc ion and copper ion are 0.050M and 5.0M respectively at room temp.
a gas sample containing 1.56 mol at 25degc exerts a pressure of 394 torr. some gas is added to the same container and
The freezing-point depression measurement of benzoic acid in acetone yields a molar mass of 122 g; the same measurement in benzene gives a value of 242 g
Choose the amino acid in the following pairs that would be more likely to appear on the solvent-eexposed surface of a protein.
A solution containing 50.0 g NaNO3 in 75.0 g of H20 at 50°C is cooled to 20°. How many grans of NaNO3 remain at 20°.
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