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ohaa [14]
3 years ago
9

I need help please....

Chemistry
2 answers:
vladimir2022 [97]3 years ago
3 0
Answer:
19c
20d
21f
22e
23h
24a
25g
26b
exis [7]3 years ago
3 0

Answer:

19. C 20. A 21. H 22. G 23. D 24. F 25. B 26. E

Explanation:

Just learnt it in science class

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A quantity of NaCl was dissolved in 100 cm of solution to obtain
soldi70 [24.7K]

Answer:

2.93g

Explanation:first, let us calculate the number of mole of NaCl present in the solution. This is illustrated below:

Molarity = 0.5M

Volume = 100cm^3 = 100/1000 = 0.1L

Mole =?

Molarity = mole /Volume

Mole = Molarity x Volume

Mole of NaCl = 0.5 x 0.1 = 0.05mole

Now we can obtain the mass of NaCl as follows:

Molar Mass of NaCl = 23 + 35.5 = 58.5g/mol

Mole of NaCl = 0.05mol

Mass of NaCl =?

Mass = number of mole x molar Mass

Mass of NaCl = 0.05 x 58.5

Mass of NaCl = 2.93g

7 0
3 years ago
Pure water is neutral. if water is neither an acid nor base what is the ph of the water
SCORPION-xisa [38]
Its pH is constant which is neither acid or base
7 0
3 years ago
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What do the elements Nickel and Technetium have in common?
nalin [4]

Answer:

nickel and Technetium are both solids

Explanation:

3 0
3 years ago
Magnesium (average atomic mass = 24.3050 amu) consists of three isotopes with masses 23.9850 amu, 24.9858 amu, and 25.9826 amu.
iris [78.8K]

Answer: The first isotope has a relative abundance of 79% and last isotope has a relative abundance of 11%

Explanation: Given that the average atomic mass(M) of magnesium

= 24.3050amu

Mass of first isotope (M1) = 23.9850amu

Mass of middle isotope (M2)=24.9858amu

Mass of last isotope(M3)= 25.9826amu

Total abundance = 1

Abundance of middle isotope = 0.10

Let abundance of first and last isotope be x and y respectively.

x+0.10+y =1

x = 0.90-y

M = M1 × % abundance of first isotope + M2 × % of middle isotope +M3 ×% of last isotope

24.03050= 23.985× x + 24.9858 ×0.10 + 25.9826×y

Substitute x= 0.90-y

Then

y = 0.11

Since y=0.11, then

x= 0.90-0.11

x=0.79

Therefore the relative abundance of the first isotope = 11% and the relative abundance of the last isotope = 79%

5 0
2 years ago
Irony can be seen in which of the following lines? (Mark all that apply.)
Flura [38]

Answer:

Awnser Is B

Explanation:

5 0
3 years ago
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