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3 years ago

PLEASE HURRY

Chemistry

1 answer:

Svetllana [295]3 years ago

5 0

<span> false, it can be used to deflect a compass needle. </span>

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How many Mol are in 4.000 grams of MgCl2 ?

grigory [225]

Answer:

The number of mol is: 0, 042 mol in 4 grams of MgCl2

Explanation:

We calculate the weight of 1 mol of MgCl2:

Weight 1mol of MgCl2= weight Mg + (weight Cl)x 2=

24, 3 grams + 2 x 35, 5 grams = 95, 3 grams/mol MgCl2

95, 3 grams------1 mol MgCl2

4 grams -------x = (4 grams x1 mol MgCl2)/ 95, 3 grams= 0, 04197 mol MgCl2

4 0

4 years ago

Consider the following reaction at 298 K:

faltersainse [42]

Answer :

$\Delta S_{sys}$ = -1622.8 J/K

$\Delta S_{surr}$ = -94.6 J/K

$\Delta S_{univ}$ = 0 J/K

Explanation : Given,

$\Delta H$ = -483.6 kJ

The given chemical reaction is:

$2H_2(g)+O_2(g)\rightarrow 2H_2O(g)$

First we have to calculate the value of $\Delta S_{sys}$ .

$\Delta S_{sys}=\frac{\Delta H}{T}$

$\Delta S_{sys}=\frac{-483.6kJ}{298K}$

$\Delta S_{sys}=-1.6228kJ/K=-1622.8J/K$

Entropy of system = -1622.8 J/K

As we know that:

Entropy of system = -Entropy of surrounding = 1622.8 J/K

and,

Entropy of universe = Entropy of system + Entropy of surrounding

Entropy of universe = -1622.8 J/K + (1622.8 J/K)

Entropy of universe = 0

8 0

3 years ago

How many times do u have to run back and forth across a football field to be meter

Taya2010 [7]

You would have to run 100 kilometers across it once. Then you will have to run 10 meters across it because a football field is 110 meters according to the NFL’s website

7 0

3 years ago

Using the phase diagram for CO2, what phase is carbon dioxide in at -60C and 1 atm pressure? A. Solid B. Gas C. At the melting p

ANTONII [103]

Answer:

B. Gas.

Explanation:

Kindly, see the attached image of CO₂ phase diagram.

Extrapolating the T from - 60.0°C and P from 1.0 atm, you will find that CO₂ is in the gas phase.

So, the right choice is: B. Gas.

7 0

3 years ago

Read 2 more answers

Which of the following is not equal to 325 cg?

Andrei [34K]

The answer is 3.25 x 10 -3 kg is not equal to 325 cg

4 0

3 years ago

Read 2 more answers