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Talja [164]
3 years ago
14

Which sentence best describes the process of convection? A. A rock melts when magma touches it. B. Water vapor in the air forms

liquid water. C. Cool air sinks, which forces warm air to rise. D. Sunlight travels through space.
Can i please get help!
Chemistry
1 answer:
Soloha48 [4]3 years ago
6 0
Convection is when cool air sinks and warm air rises. i am not 100% sure though
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Calculate the molarity of 13.1 g of NaCl in 727 mL of solution
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Answer:

The molarity of the solution is 0,31 M

Explanation:

We calculate the weight of 1 mol of NaCl from the atomic weights of each element of the periodic table. Then, we calculate the molarity, which is a concentration measure that indicates the moles of solute (in this case NaCl) in 1000ml of solution (1 liter)

Weight 1 mol NaCl= Weight Na + Weight Cl= 23 g + 35, 5 g= 58, 5 g

58, 5 g-----1 mol NaCl

13,1 g ---------x= (13,1 g x 1 mol NaCl)/58, 5 g= 0, 224 mol NaCl

727 ml solution------ 0, 224 mol NaCl

1000ml solution------x= (1000ml solutionx0, 224 mol NaCl)/727 ml solution

x=0,308 mol NaCl---> <em>The solution is 0,31 molar (0,31 M)</em>

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The answer is 20 % V/V

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We use this formula for calculate the %V/V:

%V/V= (ml solute/ml solution) x 100= (75ml/375 ml)x 100 = 20 % V/V

<em>The% V / V represents the amount of ml of solute dissolved in 100 ml of solution</em>

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