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andrew-mc [135]
3 years ago
8

A mixture of Ar, He, and O2 has a total pressure of 1,015 kPa. Argon exerts a partial pressure of 152 kPa and Helium exerts a pa

rtial pressure of 305 kPa. What is the partial pressure of oxygen in this mixture?
a.1,472 kPa
b.558 kPa
c.863 kPa
d.710 kPa
Chemistry
1 answer:
arsen [322]3 years ago
8 0
This one is easy. It's just addition and subtraction. Add the partial pressure of Argon and the partial pressure of Helium:
   152 kPa
<u>+305 kPa</u><u>
</u>  457 kPa

Next, subtract the result from the total pressure:

  1015 kPa
<u>-  457 kPa</u>
   558 kPa
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2 years ago
A 12.0% sucrose solution by mass has a density of 1.05 gem, what mass of sucrose is present in a 32.0-mL sample of this solution
natulia [17]

Answer:

Option C. 4.03 g

Explanation:

Firstly we analyse data.

12 % by mass, is a sort of concentration. It indicates that in 100 g of SOLUTION, we have 12 g of SOLUTE.

Density is the data that indicates grams of solution in volume of solution.

We need to determine, the volume of solution for the concentration

Density = mass / volume

1.05 g/mL = 100 g / volume

Volume =  100 g / 1.05 g/mL → 95.24 mL

Therefore our 12 g of solute are contained in 95.24 mL

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7 0
3 years ago
Consider the change given below. At constant pressure, is work done by the system on the surroundings? By the surroundings on th
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Sign convention :

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The given reaction is:

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3 years ago
How many moles of zinc are there in 0.890 g of zinc?
NNADVOKAT [17]

Answer:

There are  

4.517

⋅

10

23

atoms of Zn in 0.750 mols of Zn.

Explanation:

Since we know that there are  

6.022

⋅

10

23

atoms in every mole of a substance (Avogadro's Number), there are  

6.022

E

23

⋅

0.750

atoms of Zn in 0.750 mols of Zn.

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