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leonid [27]
3 years ago
9

He dissolution of gases in water is virtually always exothermic because __________. a gases react exothermically with water b th

e exothermic step in the solution-formation process is unnecessary c neither of the two endothermic steps in the solution-formation process is necessary d all three steps in the solution-formation process are exothermic e one of the two endothermic steps (separation of solute particles) in the solution-formation process is unnecessary
Chemistry
1 answer:
lara [203]3 years ago
5 0
Do you have a picture of where you go this question from?
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How much heat is gained when a 50.32g piece of aluminum is heated from 9.0°c to 16°c
Rashid [163]

Answer: 317 joules

Explanation:

The quantity of heat energy (Q) gained by aluminium depends on its Mass (M), specific heat capacity (C) and change in temperature (Φ)

Thus, Q = MCΦ

In this case,

Q = ?

Mass of aluminium = 50.32g

C = 0.90J/g°C

Φ = (Final temperature - Initial temperature)

= 16°C - 9°C = 7°C

Then, Q = MCΦ

Q = 50.32g x 0.90J/g°C x 7°C

Q = 317 joules

Thus, 317 joules of heat is gained.

5 0
3 years ago
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How many grams of H2O are needed to produce 150 g of Mg(OH)2? (Molar mass: H2O = 18.02 g/mol; Mg(OH)2 = 58.33 g/mol )
Nuetrik [128]

Answer:

92.6

Explanation:

6 mol x 18.02 g of H2o --> 3 mol x 58.33 g  Mg(OH)2

108.12 g of h2o --> 174.99 of Mg(OH)2

g of H2O is 150 g of Mg(OH)2

150g x 108.12g / 174.99 =

92.67

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3 years ago
Which is not an indicator for a chemical change?
Anastasy [175]

Answer:

A

Explanation:

Because it does not change entirely.

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. A falling object in the air possess______ *
atroni [7]

Answer:

The answer is B

B) gravitational potential energy only

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Do you know that Jesus Loves you ? If you dont know now that he does and always has and you've always had God' Grace ​
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Sorry, I don’t believe in Jesus or god etc but thnx???
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