What is the concentration of ni2 in the sample
Exactly 10.0 mL of an unknown sample of Ni2+ gave a current of 2.36 ?A. After 0.500 mL solution of 0.0287 M Ni2+ was added to the 10.0 mL sample, the current increased to 3.79 ?A. What is the concentration of Ni2+ in the sample?
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When 0.6 g of impure zinc reacted with an excess of hydrochloric acid, 135 mL of hydrogen was collected over water at 10?C. The external pressure was 745.4 Torr.
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the explosive, TNT, is composed of 37.0% carbon, 2.2% hydrogen, 18.5% nitrogen and the rest oxygen. if the molar mass of TNT is 227 g/mol, what is the empirical and molecular formula for TNT?
Classify the solid state of the following substances as ionic crystals, covalent crystals, molecular crystals or metallic crystals:
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