Which 5.0-milliliter sample of NH3 will take the shape of and completely fill a closed 100.0-milliliter container? (1) NH3 (s) (3) NH3 (g) (2) NH3 (ℓ) (4) NH3 (aq)

A compound with the empirical formula CH2 has a molar mass of 112 g/mol. What is the molecular formula for this compound?

If 5.61 g of ammonium nitrate (NH4NO3) is dissolved in 155 mL of water to make an instant cold pack, what is the molarity of the resulting solution?

A balloon now occupies 9.7L at 25.0°C and 1.00 atm. What temperature was it initially, if it occupied 9.0 L and was in a freezer with a pressure of 0.92 atm?

A sample contains 6.73 g of Na2CO3 in water to make a total of 250.0 mL of solution. What is the molarity of sodium carbonate in this solution and its mass-%? Use 1.00 g/mL as the density of the solution.

If a fossil sample originally contained 5 grams of carbon-14 and the half-life of carbon-14 is 5,700 years. After 11,400 years how many grams of carbon-14 would remain

A rock has 12.5 percent of its original amount of potassium-40 remaining in it; potassium-40 has a half-life of 1.25 billion years. How long ago was the rock formed? A. 1.25 billion years ago B. 2.5 billion years ago C. 3.75 billion years ago D.

Calcium is an element. What is the smallest particle of calcium that has all the chemical properties of calcium?

Which is the best term to use when describing the energy of motion

The pka of hypochlorous acid is 7.530. a 54.0 ml solution of 0.114 m sodium hypochlorite (naocl) is titrated with 0.337 m hcl. calculate the ph of the solution

An atom has no overall charg if it contains equal number of