For the reaction h3po4 (aq) h2po4 - (aq) + h + (aq) ∆h° = - 14.2 kj/mol. what is the ka of h3po4 at 60 °c? (a) 4.2  10-3 (b) 6.8  10-3 (c) 8.5  10-3 (d) 1.8  10-2

There are 12 inches (in). in 1 foot (ft). which expression can be used to find the number of inches in 2.5 feet?

Each Excedrin tablet contains 250 mg aspirin (ACE), 250 mg of acetaminophen (ACE), and 65 mg of caffeine (CAF). Calculate the theoretical percent (%) recovery of each component using the mass of one tablet (675 mg).

8. Which of the following is an example of a chemical element? a. Salt b. Water c. Sugar d. Sodium

What is the common name of CuCO3

Which element has the greatest electronegativity? a. Chlorine b. Oxygen c. Sulfur d. Phosphorus e. Fluorine

Which is the following closest to the thickness of a dime 3 kilometer, 3 milmeters 30 centimeter, or 30 meters

The advantage of excreting nitrogenous wastes as urea rather than as ammonia is that

Which molecule is a dipole? CH4 N2 CCl4 NO2 BF3

Calculate the enthalpy of the formation of butane, C4H10, using the balanced chemical equation and the standard value below: 4C (s) + 5H2 (g) = > C4H10 (g) Standard enthalpy of formation values: (Delta Triangle) H^0 of C (s) = - 393.

What volume of lead (of density 11.3 g/cm3) has the same mass as 330 cm3 of a piece of redwood (of density 0.38 g/cm3) ?