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Gallium arsenide (GaAs) has the zinc blende structure. The gallium atoms are in FCC packing and the arsenic atoms occupy half the tetrahedral sites. Calculate the density of Gallium arsenide (GaAs) using the following data.
Covalent Radius Ga 1.26 Ångstroms As 1.19 Ångstroms
Atomic Mass Ga:69.7 g/mole As: 74.9 g/mole
Avogadro's number (NAv) is 6.02 x 10^23 atoms per mole.
The molar heat capacity of silver is 25.35 . How much energy would it take to raise the temperature of 10.2 of silver by 19.6? With these numbers, what is the specific heat of silver
Draw as many resonance structures as you can for the following nitrogen-containing compounds. Not all will obey the octet rule. (a) N2O (b) NO (c) NO2
the original conditions on a container filled with gas at a constant temperature are 180 cc and 300 mm hg. the desired
the structure of the compound k2o is best described as a cubic closest packed array of oxide ions with the potassium
A pharmaceutical company needs to prepare a batch of 5000 bottles containing 80 tablets each with 325 mg of aspirin per tablet. How many kilograms of salicylic acid are needed to produce the needed aspirin
When 1.0 g of gasoline burns, 11500 calories of energy are given off. If the density of gasoline is 0.74 g/mL, how many kilocalories of energy are obtained from 1.1 gallons of gasoline?
what is the molarity of a solution that contains 36.0g of vitamin B1 hydrochloride (molar mass = 337g/mol) in 190mL of solution?
Part 1) What would be the specific rate constant for the reaction. Part 2) if the initial concentration of A is changed to 2.oo molar and the initial concentration of B remains the same, what would be the initial rate of reaction
One weighs 32.78 grams of NaOH and dissolves it in water (with stirring) to the mark in a 1500 mL volumetric flask. What is the molarity of this solution
What are the roots for x in this quadratic equation? 2 x2 - 7 x + 0.5 = 0 The larger root is (use 3 significant figs) The smaller root is (use 3 significant figs)
What is the pH at the point during a titration when 22 mL of 0.200 M HCl has been added to 33 mL of 0.0500 M NH3 solution? HCl is strong acid, Kb = 1.8 × 10-5 for NH3. Answer in units of pH
Lactic acid, HC3H5O3, is a monoproctic acid that forms when milk sours. An 18.50 ml sample of a solution of lactic acid required 17.52 ml of 0.1550 M NaOH to reach an end point in titration.
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