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vovikov84 [41]
3 years ago
15

PLEASE HELP THANKS

Chemistry
2 answers:
Dafna1 [17]3 years ago
8 0

Answer:

The answer is: A. 45 degrees Celsius

Explanation:

Answer:

In order to solve this problem, you need to know that an exothermic reaction is a chemical reaction that releases energy through light or heat to the environment, in the other hand, an endothermic reaction is a chemical reaction that absorbs heat from its environment.

In the problem says that an exothermic reaction is performed at a temperature of 35 degrees Celsius.

Now, keeping in mind that a exothermic reaction release heat, we can affirm that the temperature of the sistem will by increased after the reaction occurs.

Finally, the only possible answer is A, because is the only temperature which is superior to the initial temperature (35 degrees Celsius)

dimaraw [331]3 years ago
3 0

Answer:

i think 35 degrees Celsius

Explanation:

cause its the same temperature

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What is the mass of KOH found in a 785 mL of a 1.43 M solution of KOH
My name is Ann [436]

Molarity is defined as the ratio of number of moles to the volume of solution in litres.

The mathematical expression is given as:

Molarity = \frac{Number of moles}{volume of solution in litres}

Here, molarity is equal to 1.43 M and volume is equal to 785 mL.

Convert mL into L

As, 1 mL = 0.001 L

Thus, volume = 785\times 0.001 = 0.785 L

Rearrange the formula of molarity in terms of number of moles:

Number of moles =molarity\times volume of solution in litres

n = 1.43 M \times 0.785 L

= 1.12255 mole

Now,  Number of moles  = \frac{mass in g}{molar mass}

Molar mass of potassium hydroxide  = 56.10 g/mol

1.12255 mole  = \frac{mass in g}{56.10 g/mol}

mass in g = 1.12255 mole\times 56.10 g/mol

= 62.97 g

Hence, mass of KOH = 62.97 g



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___ Au₂S₃ + ___ H₂ → ___ Au + ___ H₂S
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2Au₂S₃ +  6H₂ → 4Au + 6H₂S

Explanation:

Balancing:

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