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alina1380 [7]
2 years ago
12

What is the molality of a solution of 10 g NaOH in 500 g water?Molar mass NaOH = 40 g​

Chemistry
1 answer:
umka2103 [35]2 years ago
4 0

Explanation:

Moles of NaOH = 10g / (40g/mol) = 0.25mol.

0.25mol / 500g = 0.50mol / 1000g = 0.50mol/dm³.

The molarity is 0.50mol/dm³.

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Artyom0805 [142]

Answer:

that the one kid thanks I we'll answer if 50 all ty

8 0
2 years ago
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What is the acceleration of an object if it goes from a velocity of +25m/s to rest in 5.0s?
kari74 [83]

Vf = Vi + at

0 m/s = 25 m/s + a(5sec)

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5 0
3 years ago
Given the balanced equation representing a reaction: 2h2o(l) + 571.6 kJ -> 2h2(g) + o2(g). What occurred as a result of this
Ivan

Answer: option D) energy was absorbed and entropy increased.


Explanation:


1) Given balanced equation:


2H₂O (l) + 571.6 kJ → 2 H₂ (g) + O₂(g).


2) Being the energy placed on the side of the reactants means that the energy is used (consumed or absorbed). This is an endothermic reaction.


So, the first part is that energy was absorbed.


3) As for the entropy, it is a measure of the disorder or radomness of the system.


Since, two molecules of liquid water were transformed into three molecules of gas, i.e. more molecules and more kinetic energy, therefore the new state has a greater degree of radomness, is more disordered, and you conclude that the entropy increased.


With that, you have shown that the right option is D) energy was absorbed and increased.

7 0
3 years ago
Answer Quick
kow [346]

Answer:

20.9%

Explanation:

  • The percentage by mass of solution is given by dividing the mass of solute in grams by the mass of solution in grams then multiplying it by 100%.

% Mass of solution = mass of solute/mass of solution × 100%

                               = (27.0 g/ 129.0 g) × 100%

                               = 20.93%

                               = 20.9%

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3 years ago
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I think it is 89.3%?
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