Students are given the following data for determining the average atomic mass of Lithium: A sample of Lithium consists of 400 atoms:

30 atoms are the isotope Lithium-6 (6.015 amu)

370 atoms are the isotope Lithium-7 (7.016 amu).

Which student correctly calculated the correct average atomic mass of Lithium and why?

Determine the empirical formula for succinic acid that is composed of 40.60% carbon, 5.18% hydrogen, and 54.22% oxygen.

Word equation for k+ h2o yield koh + h2

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