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lutik1710 [3]
4 years ago
8

A football player experiences acute pain in his knee. Which of the following methods can a doctor use to diagnose the reason for

the pain? (5
points)
Use infrared radiation from warm objects to look inside the knees.
Use radio waves emitted by radioactive substances to look at bones
Ob
Use radiations emitted by very hot objects to penetrate the skin and bones.
Use x-ray radiation to see if there are any fractured bones.
Od
Chemistry
1 answer:
Marat540 [252]4 years ago
8 0

Answer:

D. Use x-ray radiation to see if there are any fractured bones

Explanation:

The football player may have fractured a bone while he was practicing or playing, so it is best for the doctor to check if the player broke his bone or fractured it.

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What is the mole fraction of oxygen in a gaseous mixture containing 25 grams of oxygen, 15 grams of nitrogen, and 10 grams of he
4vir4ik [10]
Convert all the gases from grams to moles using their molar masses first. Remember that nitrogen and oxygen exist as DIATOMIC gases.

O2 - 25 g / 32 g/mol = 0.78 mol O2
N2 - 15 g / 28.02 g/mol = 0.54 mol N2
He - 10 g / 4.0 g/mol = 2.5 mol He

Add all the moles of gases.

0.78 + 0.54 + 2.5 = 3.82 moles

Divide O2 moles by total moles.

0.78/3.82 = 0.20
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What is the mass of 3.95 l of methane gas at 0.870 atm and 35.0 degrees celsius?
dalvyx [7]

Answer:

2.174 gm

Explanation:

PV = nRT       n = number of moles

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