In an experiment, 698 g of water is in a copper calorimeter cup of mass 204 g. The cup and the water are at an initial temperature of 11.3 ^oC. An unknown material with a mass of 411 g at a temperature of 421.8 ^oC is placed in the water. The system reaches thermal equilibrium at 31.1 ^oC. What is the specific heat of the unknown material?

If a heads is flipped, then the coin is flipped 4 more times and the number of heads flipped is noted; otherwise (i.e., a tails is flipped on the initial flip), then the coin is flipped 3 more times and the result of each flip (i.e., heads or tails) is noted successively. How many possible outcomes are in the sample space of this experiment?

In an acid base titration experiment, 50.0 ml of a 0.0500 m solution of acetic acid ( ka =7.5 x 10^-5) was titrated with a 0.0500 M solution of NaOH at 25 C. The system will acquire this pH after addition of 20.00 mL of the titrant:

Answer is 4.581

Please show all work

In the following experiment, a coffee-cup calorimeter containing 100 mL of H2O is used. The initial temperature of the calorimeter is 23.0 ∘C. If 7.10 g of CaCl2 is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of solution ΔHsoln of CaCl2 is −82.8 kJ/mol.

Express your answer with the appropriate units.

A 9.106 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 18.19 grams of CO₂ and 7.449 grams of H₂O are produced.

In a separate experiment, the molar mass is found to be 88.11 g/mol. Determine the empirical formula and the molecular formula of the organic compound.
What is the empirical formula?

when 1.6038 g of an organic iron compound Fe, C, H and O was burned in O2, 2.9998 g of CO2 and 0.85850 g of H2O were produced. In a separate experiment to determine the mass percent of iron, 0.2726 g of the compound yielded 0.06159 g of Fe2O3. What is the empirical formula of the compound?

When 1.661 grams of a hydrocarbon, C_xH_y, were burned in a combustion analysis apparatus, 5.211grams of CO₂ and 2.134 grams of H₂O were produced.

In a separate experiment, the molar mass of the compound was found to be 42.08 g/mol. Determine the empirical formula and the molecular formula of the hydrocarbon.

Enter the elements in the order presented in the question.

When 5.895 grams of a hydrocarbon, C_xH_y, were burned in a combustion analysis apparatus, 18.50 grams of CO₂and 7.574 grams of H₂O were produced.

In a separate experiment, the molar mass of the compound was found to be 42.08 g/mol. Determine the empirical formula and the molecular formula of the hydrocarbon.

Empirical formula?

Molecular formula?

In the following experiment, a coffee-cup calorimeter containing 100 mL of H2O is used. The initial temperature of the calorimeter is 23.0 ∘C. If 8.50 g of CaCl2 is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of solution ΔHsoln of CaCl2 is −82.8 kJ/mol.

Express your answer with the appropriate units.

Lab Experiment 9 Acid‐Base I – Titration

1. Define and explain titration.

2. In the experimental procedure, the buret is prepared by pre‐rinsing with NaOH and discarding the rinse. Explain the purpose of pre‐rinsing the buret with NaOH solution and identify what errors might be introduced if prerinsing is not performed before a titration.