A sample of pure lithium carbonate contains 18.8% lithium by mass. What is the % lithium by mass in a sample of pure lithium carbonate that has one-half the mass of the first sample?

What is the chemical symbol for an atom that has 45 protons and 58 neutrons?

Who created the forerunner of the modern periodic table?

Sodium metal and water react to form hydrogen and sodium hydroxide. If 8.43 g of sodium react with water to form 0.37 g of hydrogen and 14.68 g of sodium hydroxide, what mass of water was consumed in the reaction?

What is the mass of one atom of the element oxygen? (1 amu = 1.67 × 10-24 g)

A sailor circumnavigated the earth and covered 4,264,000 meters. Express this number in kilometers and in standard scientific notation.

Balance the chemical equation given below, and determine the number of moles of iodine that reacts with 20.0 g of aluminum.________ Al(s) + ________ I2(s) → ________ Al2I6(s)

Which of the following is the chlorite anion?

The thiosulfate ion is

If the melting point of aluminum metal is 1220°F, what is its melting point in Kelvin?