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Joshua S.
Tutor for eight years and future teacher
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Chemistry
TutorMe
Question:

A Hydrocarbon gas is contained in a 5.00 L vessel. The pressure of the gas is 0.640 atm at a temperature of 116C. How many mols of the gas are inside the container? After adding O2 gas to the container, the pressure is 1.300 atm. What is the partial pressure of O2 in the vessel at 116C?

Joshua S.
Answer:

n = .100 mols Partial pressure of O2 = .660atm

Basic Chemistry
TutorMe
Question:

2Al + 3Cl2 ---> 2AlCl3 If 7.00g of Al react with 20.0g of Cl2, how much AlCl3 is made, in grams? Which reagent is in excess and how many grams are left over of this reagent? (Al: 26.98 g/mole) (Cl: 35.45 g/mole)

Joshua S.
Answer:

25.07g of AlCl3 are made and Al is in excess by 1.93g

Calculus
TutorMe
Question:

A car's velocity follows the function v(t)= -(t)^2 +6t -5 where t is in seconds and v(t) is in m/s for a portion of its journey. What is the car's minimum and maximum velocities in the first five seconds and how far had it moved in the first five seconds?

Joshua S.
Answer:

Its maximum velocity is at t=3s, its minimum velocity is at 0s, and it traveled 25/3 m over the first five seconds.

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