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Aluminum reacts with oxygen gas in a combination reaction to produce aluminum oxide. How many moles of oxygen gas are needed to react with 1.64 moles of aluminum? Hint: Write and balance the chemical equation for this reaction. Report your answer in moles with the correct number of significant figures. Answer: moles oxygen gas
A 370. mL air sample collected at 35°C has a pressure of 550. torr. What pressure will the air exert if it is allowed to expand to 425 mL at 49°C.
Hydrogen gas was collected over water in a eudiometer at 25 C when the atmospheric pressure was 752 mm Hg. What was the pressure of the hydrogen gas?
A copper wire (density = 8.96 g/cm3) has a diameter of 0.18 mm. If a sample of this copper wire has a mass of 33 g, how long is the wire?
Explain what happens to the atomic number of a nucleus when positron emission occurs
The carbon and amino nitrogen of muscle alanine are radiolabeled with 14C and 15N respectively. Outline the metabolic journey that could result in the presence of
What type of radioactive decay would be expected for the unstable nuclide
Verify the following statements (a) One part per million corresponds to one minute in two years, or a single penny in $10,000.
The resulting mixture exerts a pressure of 745 mm Hg at 95 C. What was the mass of the original sample?
When you analyze the proteins by electrophoresis, you find that protein B moves further towards the positive end of the gel. Explain if this result is consistent with your hypothesis about the difference between the two proteins.
An unknown gas effuses 0.917684 times as fast as oxygen gas under the same conditions. What is the molar mass (g/mol) of the unknown gas. What is the chemical formula of the unknown gas.
A Scientist uses an ultra-high vacuum chamber that has a pressure of 6.5x 10^-12 torr. If the temperature is 298 K, how many molecules are there in 2.0 cm^3? What is the molar volume
What volume of solution should be dispensed from the buret to provide 5.633 mmol CO2-3 ? Answer in units of mL.
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