What do we mean by an atom?

What is the mass of oxygen in 300 g of sulfuric acid (H2SO4) ? A. 64g B. 196g C. 210g D. 300g

16) How many photons are contained in a burst of yellow light (589 nm) from a sodium lamp that contains 609 kJ of energy? A) 3.37 * 1019 photons B) 3.06 * 1030 photons C) 1.81 * 1024 photons D) 4.03 * 1028 photons E) 2.48 * 1025 photons

A mixture containing 21.4 g of ice (at exactly 0.00 ∘C) and 75.3 g of water (at 80.2 ∘C) is placed in an insulated container. Assuming no loss of heat to the surroundings, what is the final temperature of the mixture? A mixture containing 21.

Plutonium-240 decays according to the function / [Q (t) = Q _{o}e ^{-kt}/] where Q represents the quantity remaining after t years and k is the decay constant, 0.00011 ... How long will it take 36 grams of plutonium-240 to decay to 12 grams?. A.

Calculate the pH of a buffer that is 0.205M in NaHCO3 and 0.285M in Na2CO3.

A mixture of 0.10 mol of NO, 0.050 mol of H2, and 0.10 mol of H2O is placed in a 1.0-L vessel at 300 K. The following equilibrium is established: 2NO (g) + 2H2 (g) ⥫⥬==N2 (g) + 2H2O (g) At equilibrium [NO]=0.062M.

Which statements accurately describe the polarity and electronegativity of water?

Which of the following could lead to static discharge? water molecules sticking together at a surface the force of gravity pulling an object to Earth a vibration compressing molecules of air the build up of electrons on the atoms of an object

Which requires the removal of heat, melting or freezing? Is it evaporation? What is it? Why?

Waves are the major force of erosion along coasts