Concept explainers
Gallium arsenide (GaAs) has gained widespread use insemiconductor devices that interconvert light and electricalsignals in fiber-optic communications systems.Galliumconsists of 60.%
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Chemical Principles
- In 1774, C. Scheele obtained a gas by reacting pyrolusite (MnO2) with sulfuric acid. The gas, which had been obtained that same year by Joseph Priestley by a different method, was an element, A. (a) What is the element isolated by Scheele and Priestley? (b) Element A combines with almost all other elements. For example, with cesium it gives a compound in which the mass percent of A is 19.39%. The element combines with hydrogen to give a compound with a mass percent of element A of 94.12%. Determine the formulas of the cesium and hydrogen compounds. (c) The compounds of cesium and hydrogen with element A react with one another. Write a balanced equation for the reaction.arrow_forwardGallium arsenide, GaAs, has gained widespread use in semiconductor devices that convert light and electrical signals in fiber-optic communications systems. Gallium consists of 60.% 69Ga and 40.% 71Ga. Arsenic has only one naturally occurring isotope, 75As. Gallium arsenide is a polymeric material, but its mass spectrum shows fragments with the formulas GaAs and Ga2As2. What would the distribution of peaks look like for these two fragments?arrow_forwardChlorine exists mainly as two isotopes, 37Cl and 33Cl. Which is more abundant? How do you know?arrow_forward
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- Calculate the number of atoms of silicon (Si) in 415 cm3of the colorless gas disilane at 0°C and atmospheric pressure, where its density is 0.00278 g cm-3 . The molecular formula of disilane is Si2H6.arrow_forwardWhat is Compound 4? CH;CI / AICI, Cl2 / FeCla CH,MgBr 2 H20 3 4 OH OH OH OH O B O D O Aarrow_forwardWhich one of the following has the smallest mass percent of F in the compound? A) SF₆ B) NaF C) XeF₂ D) KrF₄arrow_forward
- What is the mass percent of aluminum in Al(NO3)3 • 9H2O?arrow_forwardWhat is the molecular mass (in amu) of a synthetic chlorinated caffeine molecule? The formula for this very unusual caffeine derivative is C8Cl10N4O2arrow_forward7. Balance the following equations: a) For the synthesis of urea, a common fertilizer CO2(g) + NH3(g) → NH₂CONH2(s) + H2₂0 (1)arrow_forward
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