General Chemistry Answers

Ammonia is reacted with phosphoric acid in a neutralization reaction. Indicate the ion/s that are spectator ions in the total ionic equation of this reaction.

Lead (II) nitrate is reacted with sodium iodide. Calculate the number of Pb²⁺ ions required to form 1.1 g of precipitate. Write the balanced molecular, total ionic, and net ionic equations of the reaction.

Atomic Mass:

Pb: 207.2 g/mol

N: 14.0067 g/mol

O: 15.999 g/mol

Na: 22.989769 g/mol

I: 126.90447 g/mol

Note: Use scientific notation with the format (n)e(x) where n = number and x = exponent (Example: 6.022e23 for 6.022 x 10²³)

An acid, HEl, is formed from a hypothetical element, El, and a subsequent aqueous solution is created with the acid and water. The solution is measured to be 22.49% HEl by weight. Calculate the mol % of the acid in the solution.

Atomic Mass:

H: 1.00784 g/mol

O: 15.999 g/mol

El: 142.76243 g/mol

The solubility of the hydroxide of a hypothetical metal, Me, in water is 144.27 g MeOH per 54.88 mL water. Calculate the amount of water in mL needed to dissolve 32.41 g of MeOH.

What fraction of the α particles in Rutherford's gold foil experiment are scattered at large angles? Assume the gold foil is two layers thick, as shown in the figure, and that the approximate diameters of a gold atom and its nucleus are 2.7 Å and 1.5×10^-4 Å. Express your answer to two significant figures.

Alexandria decides to climb Mt. Krumpett, which is 5000 m high. she determines that this will require a total of 2250 kcal of energy for the trip. For her food supply, She decides to take nutrition bars . The label states that each bar contains 50 g of carbohydrates,10 g of fat, 40g of protein. How many nutrition bars should Alexandra pack? Express the number numerically.

the ratio of reactants to product is 1;3;2 in the reaction N2+3H2>>2NH3 thus is

An unknown volume of 5.00 M lithium sulfate, Li2SO4 solution is added to 0.160 L of water to form a 0.300 M Li2SO4 solution.

(i) Calculate the volume of the stock solution used in the dilution.

(ii) Calculate the molarity of lithium ions, Li+ in the solution.

Compute for the pH of an acetate buffer produced by mixing 500 ml of a 0.5 M NaHCO 3 solution and

300 ml of 0.25 M H 2 CO 3 solution.