The semiconductor alloys of gallium arsenide (gaas) and gallium phosphide (gap) are used to make red, yellow and orange light-emitting diodes. both gaas and gap have the zinc blende crystal structure and are soluble in one another at all concentrations. determine the concentration in weight percent of gap that must be added to gaas to yield a unit cell edge length of 0.5570 nm. the densities of gaas and gap are 5.316 and 4.130 g=cm3, respectively.

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in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

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sulfur belongs to group 16 because it can be found in nature whether it is in a free or combined state.

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"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"