2 years ago

Which pulley system will allow the armchair to be lifted with the least amount of effort?

Chemistry

2 answers:

lyudmila [28]2 years ago

7 0

ANSWER:

I think it's C

Explanation:

I just learned about this in science class and I'm pretty sure you need 2 pulleys to make it easier to pull

guapka [62]2 years ago

5 0

Answer:

Option D.

Explanation:

Option D. Since tension experimented by the rope is equal to one sixth of the weight of armchair.

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Consider the reactionI2(g) + Cl2(g)2ICl(g)Using standard thermodynamic data at 298K, calculate the entropy change for the surrou

Georgia [21]

We know,

$\Delta H_{I_2(g)}=62.438\ KJ/mol\\\\\Delta H_{Cl_2(g)}= 0.0\ KJ/mol\\\\\Delta H_{ICl(g)}=17.78\ KJ/mol$

For given reaction, $I_2(g)+Cl_2(g)\ -->\ 2ICl(g)$

$\Delta H_{rxn}=2\Delta H_{ICl(g)}-\Delta H_{I_2(g)}-\Delta H_{Cl_2(g)}\\\\\Delta H_{rxn}=2(17.78)-0-62.438\ KJ/mol\\\\\Delta H_{rxn}=-26.878\ KJ/mol$

For , 2.41 moles of $I_2$ :

$\Delta H_{rxn}=2.41\times (-26.878)\ KJ\\\\\Delta H_{rxn}=-64.78\ KJ$

We know :

$\Delta S = -\dfrac{\Delta H_{rxn}}{T}\\\\\Delta S = -\dfrac{-64.78}{298}\ KJ/K\\\\\Delta S =-0.21738 \ KJ/K\\\\\Delta S=-217.38\ J/K$

Hence, this is the required solution.

7 0

3 years ago

Interpolate: Use the equation to determine what the student enrollment in 2003 likely was.

sdas [7]

Answer:

1244 students

Explanation:

That would be y = 82*3 + 998

= 1244.

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3 years ago

Read 2 more answers

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monitta

Answer:

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Explanation:

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3 years ago

Why do we have to pay if its just learning

Oxana [17]

Answer:

what are we paying for?

Explanation:

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3 years ago

An atom of Fe has 30 neutrons. What is the mass number of this atom?

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Answer:

Explanation:

The mass number of an atom is a sum of its number of protons and neutrons. Iron (Fe) has an atomic number of 26. This means that it has 26 protons. Since we know it has 26 protons and are told it has 30 neutrons. The mass number of this atom of Iron is 26+30 = 56

Hope this helped!

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3 years ago