Part 1: Calculate the mass percent (m/m) of a solution prepared by dissolving 49.53 g of NaCl in 162.7 g of H2O. Express your answer to four significant figures. Part 2: Vinegar is a solution of acetic acid in water. If a 285 mL bottle of distilled vinegar contains 28.0 mL of acetic acid, what is the volume percent (v/v) of the solution? Express your answer to three significant figures.

Part 3: Calculate the mass/volume percent (m/v) of 18.5 g NaCl in 59.5 mL of solution.
Express your answer to three significant figures.

Part 4: Calculate the molarity (M) of 159.8 g of H2SO4 in 1.030 L of solution.
Express your answer to four significant figures.

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

Predict whether the changes in enthalpy, entropy, and free energy will be positive or negative for the boiling of water, and explain your predictions. how does temperature affect the spontaneity of this process?

The reactions shown here can be combined to make the overall reaction c(s) + h2o(g) ⇌ co(g) + h2(g) by reversing some and/or dividing all the coefficients by a number. a. c(s) + o2(g) → co2(g) k=1.363×10^69 b. 2 h2(g) + o2(g) → 2 h2o(g) k=1.389×10^80 c. 2co(g) + o2 (g) → 2 co2(g) k=1.477×10^90