General Chemistry Answers

2Al(s) + 3CaBr2(aq) —> 2AlBr3(aq) + 3Ca(s) if 4 moles of aluminum are reacted with 9 moles of calcium bromide witch chemical will be the limiting reagent

what is it called when more bonds = more electronegativity

Combustion reactions are a notable source of carbon dioxide in the environment. Using the following balanced equation, how many grams of carbon dioxide are formed when 100.00 g of propane (C3H8) is burned? Express your answer to the correct number of significant figures. Be sure to show all steps completed to arrive at the answer.

C₃H₈ +5O₂ = 3CO₂+4H₂O

   Combustion reactions are a notable source of carbon dioxide in the environment. Using the following balanced equation, how many grams of carbon dioxide are formed when 100.00 g of propane (C3H8) is burned? Express your answer to the correct number of significant figures. Be sure to show all steps completed to arrive at the answer.

C₃H₈ + 5O₂ = 3CO₂ + 4 H₂O

A 65.0 mL solution of  perchloric acid with a pH of 1.12 is diluted to a final volume of 2.30 L.  What is the pH of the final solution? (

using the data in the table, determine the rate constant of the reaction and select the appropriate units.

A+2B -----> C+D

Table:

Trail / [A] (M) / [B] (M) / Rate (M/s)

1 / 0.220 / 0.370 / 0.0169

2 / 0.220 / 0.740 / 0.0169

3 / 0.440 / 0.370 / 0.0676

k=

Units=

Find k and units.

The decomposition of N₂O₅ can be described by the equation

2N₂O₅(soln) ------> 4NO₂(soln) + O₂(g)

consider the data in the table for the reaction at 45*C in carbon tetrachloride solution.

Table:

t(s) / [N₂O₅] (M)

0 / 1.824

205 / 1.603

406 / 1.413

805 / 1.099

Given the data, calculate the average rate of reaction for each successive time interval.

what is the average rate of reaction for the time interval 0s to 205s?

what is the average rate of reaction for the time interval 205s to 406s?

what is the average rate of reaction for the time interval 406s to 805s?

Consider the reaction described by the equation

C₂H₄Br₂(aq)+3I^-(aq) ------> C₂H₄(g)+2Br^-(aq)+I^-₃(aq)

The rate law is

rate = k[C₂H₄Br₂][I^-]

where k = 0.00599 M^-1 s^-1

what are the missing entries in the table?

Run / [C₂H₄Br₂]₀ (M) / [I^-]₀ (M) / initial rate of formation of C₂H₄ (M s^-1)

1 / x / 0.156 / 0.000583

2 / 0.156 / y / 0.000292

3 / 0.156 / 0.156 / z

find x, y, z

The percentage of oxygen in air can be determined by the following experiment.

The gas syringe contains 50 cm3 of air. The large pile of copper is heated and the air is passed from one gas syringe to the other over the hot copper. The large pile of copper turns black. The gas is allowed to cool and its volume measured.

The small pile of copper is heated and the remaining gas passed over the hot copper.

The copper does not turn black. The fi nal volume of gas left in the apparatus is less than 50 cm3.

(i) Explain why the copper in the large pile

The reaction has a Kc value of 2400 at 2000 K. If 0.850 M each of N2 and O2 are initially present in a 3.00 L vessel, calculate the equilibrium concentrations of NO, N2, and O2.