Chemistry Atoms First2e
2nd Edition
ISBN: 9781947172647
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 8, Problem 70E
Before small batteries were available, carbide lamps were used for bicycle lights. Acetylene gas.
(a) Outline the steps necessary to answer the following question: What volume of
(b) Answer the question.
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Write the balanced chemical equation for conversion of Al(s) to KAl(SO4)2·12H2O(s) in aqueous solution.
A student experimentally determines the gas law constant, R, by reacting a small piece of magnesium
with excess hydrochloric acid and then collecting the hydrogen gas over water in a eudiometer. Based
L-atm
on experimentally collected data, the student calculates R to equal 0.0832
mol·K
L-atm
Ideal gas law constant from literature: 0.08206
mol·K
(a) Determine the percent error for the student's R-value.
Percent error =
%
(b) For the statements below, identify the possible source(s) of error for this student's trial.
The student notices a large air bubble in the eudiometer after collecting the hydrogen gas, but
does not dislodge it.
The student does not clean the zinc metal with sand paper.
The student does not equilibrate the water levels within the eudiometer and the beaker at the
end of the reaction. The water level in the eudiometer is 1-inch above the water level in the
beaker.
The student uses the barometric pressure for the lab to calculate R.
Some Chem 16.1 students were tasked to perform the ideal gas experiment with some modifications.
Instead of magnesium ribbon, the students were to use 0.029 g of aluminum foil. They prepared the
eudiometer by adding 6M HCI and filling it with water to the brim. Once the setup was complete, they
performed the experiment. Note that the aluminum was completely consumed in the reaction. From the
experiment, it was found that the external pressure was 1.05 atm at 30.0 °C, and the volume of the air
inside the eudiometer was 33.5 mL. The water level inside the eudiometer is 4.15 cm below the surface
of the water level outside. Given these measurements and the following constants, answer the proceeding
questions.
At 30.0°C, Pvapor = 31.8 mmHg
• R = 0.08206 L-atm/mol-K = 62.36 L-torr/mol-K
• MWAI = 26.98 g/mol
A. Find the value of the pressure of dry air (PDA) in torr.
B.
Give the balanced chemical reaction of the aluminum metal with the acid.
C. Find the experimental mass (in grams) of…
Chapter 8 Solutions
Chemistry Atoms First2e
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