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zzz [600]
3 years ago
9

How much heat (in kj) is released when 3.600 mol naoh(s) is dissolved in water? (the molar heat of solution of naoh is â445.1 kj

/mol.)?
Chemistry
2 answers:
Fantom [35]3 years ago
8 0
<span>-1602 kj

Sauce:me

Your welcome
</span>
pav-90 [236]3 years ago
6 0

Answer : The amount of heat released is, -1602.36 KJ

Explanation : Given,

Moles of NaOH = 3.600 mole

Molar heat of solution of NaOH = -445.1 KJ/mole

Now we have to calculate the amount of heat released.

As, 1 mole of NaOH is dissolved in water then heat released = - 445.1 KJ

So, 3.600 mole of NaOH is dissolved in water then heat released = -445.1\times 3.600=-1602.36KJ

Therefore, the amount of heat released is, -1602.36 KJ

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Does the physical form of the material matter for mass-mole<br> and mole-mass calculations?
natulia [17]
Tin metal reacts with hydrogen fluoride to produce tin(II) fluoride and hydrogen gas according to the following balanced equation.

Sn(s)+2HF(g)→SnF2(s)+H2(g)
Sn(s)+2HF(g)→
SnF
2
(s)+
H
2
(g)

How many moles of hydrogen fluoride are required to react completely with 75.0 g of tin?

Step 1: List the known quantities and plan the problem.

Known

given: 75.0 g Sn
molar mass of Sn = 118.69 g/mol
1 mol Sn = 2 mol HF (mole ratio)
Unknown

mol HF
Use the molar mass of Sn to convert the grams of Sn to moles. Then use the mole ratio to convert from mol Sn to mol HF. This will be done in a single two-step calculation.

g Sn → mol Sn → mol HF

Step 2: Solve.

75.0 g Sn×1 mol Sn118.69 g Sn×2 mol HF1 mol Sn=1.26 mol HF
75.0 g Sn×
1
mol Sn
118.69
g Sn
×
2
mol HF
1
mol Sn
=1.26 mol HF

Step 3: Think about your result.

The mass of tin is less than one mole, but the 1:2 ratio means that more than one mole of HF is required for the reaction. The answer has three significant figures because the given mass has three significant figures.
4 0
3 years ago
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Given the reaction for the nickel-cadmium battery: 2NiOOH + Cd +2H2O -&gt; 2Ni(OH)2 + Cd(OH)2 What species is oxidized during th
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Answer:

Cd is oxidized during the discharge of the battery

Explanation:

Based on the reaction:

2 NiOOH + Cd + 2H₂O → 2Ni(OH)₂ + Cd(OH)₂

And knowing Oxygen and hydrogen never change its charge, we must to find oxidation state of Ni and Cd before and after the reaction:

<em>Ni:</em>

In NiOOH: 2 O = -2*2 = -4 + 1H = +1, = -4 + 1 = -3. And as the molecule is neutral, Ni is 3+

In Ni(OH)₂: OH = -1. As there are 2 OH = -2. That means Ni is +2

The Ni is gaining one electron, that means is been reduced

<em>Cd:</em>

Cd before reaction is as pure solid with oxidation state = 0

Cd after the reaction is as Cd(OH)₂: 2 OH = -2. That means Cd is +2

The Cd is loosing 2 electrons, that means is the species that is oxidized.

8 0
3 years ago
4 pts
stich3 [128]

Answer:

C

Explanation:

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Answer:

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