Topic
Q:
FOR PRACTICE 6.10 A diver breathes a heliox mixture with an oxygen mole fraction of 0.050 . What must the total
pressure be for the partial pressure of oxygen to be 0.21 atm ?
Q:
11. Um elemento M apresenta os isótopos \( { }^{\mathrm{T}} \mathrm{M} \) e \( { }^{81} \mathrm{M} \). Sabendo que a massa atómica do elemento M é 79,90
determine os percentuais de cada isótopo de elemento M .
Q:
Type the correct answer in each box. Use numerals instead of words. Express your answer in scientific notation.
The isotope chlorine-36 decays into argon-36, with a half-life of \( 3.01 \times 10^{5} \) years. Based on this information, fill in the blanks.
A particular sample contains \( 3 \times 10^{12} \) atoms of chlorine-36. After \( 9.03 \times 10^{5} \) years, there will
atoms of argon-36.
Q:
Iridium-192 has a half-life of about 74 days.
After 148 days, how many milligrams of a 900 mg sample will remain?
Q:
Which of the following processes absorbs heat?
a. Dry ice sublimates at room temperature to form \( \mathrm{CO}_{2} \) gas.
b. \( \mathrm{NH}_{3} \) gas condenses under a cold bath of \( -35^{\circ} \mathrm{C} \) to the liquid form.
c. Liquid glacial acetic acid freezes in an ice-water bath.
d. Iodine vapor captured in a jar forms crystalline iodine when it contacts the cooler lid.
Q:
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much more: mometrix.com/bonus 948 /acsgenchem
mich of the following processes absorbs heat?
Dry ice sublimates at room temperature to form \( \mathrm{CO}_{2} \) gas.
S. \( \mathrm{NH}_{3} \) gas condenses under a cold bath of \( -35^{\circ} \mathrm{C} \) to the liquid form.
c. Liquid glacial acetic acid freezes in an ice-water bath.
d. Iodine vapor captured in a jar forms crystalline iodine when it contacts the cooler lid.
Q:
4. What is an isotope?
Q:
9 Calcula la masa molar de un compuesto orgánico sa-
biendo que \( 1,75 \mathrm{~g} \) de compuesto disueltos en 150 mL de
disolución producen, a \( 20^{\circ} \mathrm{C} \), una presión osmótica de
\( 623,2 \mathrm{mmHg} \).
Q:
5 Se sabe que a \( 40^{\circ} \mathrm{C} \) la presión de vapor del agua es
55,4 mmHg. Calcula la presión de vapor de la disolu-
ción, supuesta ideal, obtenida al mezclar 1 L de agua con
200 g de sacarosa \( \left(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\right) \).
Datos: masas atómicas: \( \mathrm{C}=12 ; \mathrm{H}=1 ; \mathrm{O}=16 ; \rho_{\text {agua }}=1 \mathrm{~g} / \mathrm{mL} \)
Q:
A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 3.80 kg of water at \( 24.9{ }^{\circ} \mathrm{C} \). During the reaction \( 127 . \mathrm{kJ} \) of
heat flows out of the bath and into the flask.
Calculate the new temperature of the water bath. You can assume the specific heat capacity of water under these conditions is \( 4.18 \mathrm{~J} \cdot \mathrm{~g}{ }^{-1} \cdot \mathrm{~K}^{-1} \). Round your
answer to 3 significant digits.
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