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ikadub [295]
3 years ago
12

Please help- thank you-

Chemistry
2 answers:
Alja [10]3 years ago
7 0
1. ?
2. Pollination
3. Population
4. Egg
5. Tadpole
6. Froglet
7. Adult
8. Sun
9. Food web
10. Plants
11. Producers
12. Year
13. Increase
14. 80.5 ?
15. 75.1 ?
16. Cause it to develop
17. C
18.
19.
20.
21.
22.
23. E
24. Sweet potatoes
Flauer [41]3 years ago
4 0
Dang that’s crazy.. Goodluck ..
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What happens when gases change to plasma?
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8 0
3 years ago
A solution is made by dissolving
AVprozaik [17]

Answer:

0.342 m

Explanation:

From the question given above, the following data were obtained:

Mass of NaBr = 14.57 g

Mass of water = 415 g

Molar mass of NaBr = 102.89 g/mol

Molality of NaBr =?

Next, we shall determine the number of mole in 14.57 g of NaBr. This can be obtained as follow:

Mass of NaBr = 14.57 g

Molar mass of NaBr = 102.89 g/mol

Mole of NaBr =?

Mole = mass / molar mass

Mole of NaBr = 14.57 / 102.89

Mole of NaBr = 0.142 mole

Next, we shall convert 415 g of water to kg. This can be obtained as follow:

1000 g = 1 Kg

Therefore,

415 g = 415 g × 1 Kg / 1000 g

415 g = 0.415 Kg

Thus, 415 g is equivalent to 0.415 Kg.

Finally, we shall determine Molality of the solution as follow:

Mole of NaBr = 0.142 mole

Mass of water = 0.415 Kg

Molality of NaBr =?

Molality = mole / mass of water in Kg

Molality of NaBr = 0.142 / 0.415

Molality of NaBr = 0.342 m

Therefore, the molality of NaBr solution is 0.342 m.

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3 years ago
Why is it important to use fine adjustment when focusing with the high power on a microscope?
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Coarse and fine adjustment The coarse adjustment knob should only be used with the lowest power objective lens. Once it is in focus, you will only need to use the fine focus. Using the coarse focus with higher lenses may result in crashing the lens into the slide.

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