[SOLVED] several stoichiometry

I’m working on a Chemistry exercise and need support.

find the empirical and molecular formula for the following

1. When 4.528 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 15.55 grams of CO2 and 2.547 grams of H2O were produced. In a separate experiment, the molar mass of the compound was found to be 128.2 g/mol. Determine the empirical formula and the molecular formula of the hydrocarbon.

2. When 6.425 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 20.16 grams of CO2 and 8.255 grams of H2O were produced. In a separate experiment, the molar mass of the compound was found to be 28.05 g/mol. Determine the empirical formula and the molecular formula of the hydrocarbon.

3. A 2.072 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 4.709 grams of CO2 and 1.928 grams of H2O are produced. In a separate experiment, the molar mass is found to be 116.2 g/mol. Determine the empirical formula and the molecular formula of the organic compound.

find the molarity for the following

1. In the laboratory a student combines 35.4 mL of a 0.458 M aluminum bromide solution with 22.9 mL of a 0.478 M aluminum iodide solution. What is the final concentration of aluminum cation ?

2. In the laboratory a student combines 35.1 mL of a 0.398 M ammonium bromide solution with 29.5 mL of a 0.519 M ammonium nitrate solution. What is the final concentration of ammonium cation ?

3. In the laboratory a student combines 38.1 mL of a 0.372 M potassium hydroxide solution with 10.8 mL of a 0.531 M sodium hydroxide solution. What is the final concentration of hydroxide anion ?

What volume of a 0.268 M hydrobromic acid solution is required to neutralize 15.6 mL of a 0.146 M potassium hydroxide solution?

What volume of a 0.201 M hydrochloric acid solution is required to neutralize 25.2 mL of a 0.173 M sodium hydroxide solution?

What volume of a 0.148 M calcium hydroxide solution is required to neutralize 19.4 mL of a 0.150 M perchloric acid solution?

An aqueous solution of potassium hydroxide is standardized by titration with a 0.187 M solution of perchloric acid.

If 15.9 mL of base are required to neutralize 22.7 mL of the acid, what is the molarity of the potassium hydroxide solution?

An aqueous solution of hydrochloric acid is standardized by titration with a 0.192 M solution of barium hydroxide.

If 23.1 mL of base are required to neutralize 29.0 mL of the acid, what is the molarity of the hydrochloric acid solution?

An aqueous solution of barium hydroxide is standardized by titration with a 0.168 M solution of nitric acid.

If 14.3 mL of base are required to neutralize 12.6 mL of the acid, what is the molarity of the barium hydroxide solution?

A student is asked to standardize a solution of sodium hydroxide. He weighs out 1.01 g potassium hydrogen phthalate (KHC₈H₄O₄, treat this as a monoprotic acid).

It requires 27.0 mL of sodium hydroxide to reach the endpoint.

A. What is the molarity of the sodium hydroxide solution?

M

This sodium hydroxide solution is then used to titrate an unknown solution of hydroiodic acid.

B. If 21.5 mL of the sodium hydroxide solution is required to neutralize 22.9 mL of hydroiodic acid, what is the molarity of the hydroiodic acid solution?

M

A student is asked to standardize a solution of potassium hydroxide. He weighs out 1.09 g potassium hydrogen phthalate (KHC₈H₄O₄, treat this as a monoprotic acid).

It requires 38.9 mL of potassium hydroxide to reach the endpoint.

A. What is the molarity of the potassium hydroxide solution?

M

This potassium hydroxide solution is then used to titrate an unknown solution of nitric acid.

B. If 13.2 mL of the potassium hydroxide solution is required to neutralize 29.5 mL of nitric acid, what is the molarity of the nitric acid solution?

M

A student is asked to standardize a solution of potassium hydroxide. He weighs out 0.931 g potassium hydrogen phthalate (KHC₈H₄O₄, treat this as a monoprotic acid).

It requires 39.7 mL of potassium hydroxide to reach the endpoint.

A. What is the molarity of the potassium hydroxide solution?

M

This potassium hydroxide solution is then used to titrate an unknown solution of hydrobromic acid.

B. If 14.5 mL of the potassium hydroxide solution is required to neutralize 10.8 mL of hydrobromic acid, what is the molarity of the hydrobromic acid solution?

M