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how does one determine a percent composition from an empirical formula?

Which statement best explains the relationship between an area is geography and the temperature of its surface water

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?