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2 years ago

14

Solids have: fixed shape fixed shape and size fixed size no fixed shape

2 answers:

Aliun [14]2 years ago

8 0

The answer is: Fixed shape and size

Explanation:

• Solids have a fixed shape and a fixed size.
• The particles are very close together and held in place by strong
forces (bonds).
• Their particles cannot move around, but they do vibrate.
• Because the particles cannot move around, a solid has a fixed shape.

elena-s [515]2 years ago

4 0

Answer:

ummm is the question wrong or I am reading it wrong

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What is the partial pressure of helium gas in a mixture that contains 8.00 grams of helium and 8.60 mol argon gas with a total p

Agata [3.3K]

Answer:

$P_{He}=9.06torr$

Explanation:

Hello there!

In this case, we can identify the solution to this problem via the Dalton's rule because the partial pressure of helium is given by:

$P_{He}=x_{He}P_T$

Whereas the mole fraction of helium is calculated by firstly obtaining the moles and then the mole fraction:

$n_{He}=8.00g\frac{1mol}{4.00g}=2.00mol\\\\ x_{He}=\frac{n_{He}}{n_{He}+n_{Ar}} \\\\ x_{He}=\frac{2.00mol}{2.00mol+8.60mol}\\\\x_{He}=0.189$

Then, we calculate the partial pressure as shown below:

$P_{He}=0.189 *48.0torr\\\\P_{He}=9.06torr$

Best regards!

4 0

2 years ago

When 0.25 moles of NH3 are produced according to the reaction below, how many moles of H2 must have reacted?

marissa [1.9K]

Answer:

Explanation:

by stoichiometry

nNH3/2=nH2/3

0.25/2=nH2/3

nH2=0.25×3/2

nH2=0.375 mol

so its 0.38 mol

6 0

2 years ago

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