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lutik1710 [3]
3 years ago
12

How many moles of sodium metal are needed to make 3.6 moles of sodium chloride?

Chemistry
1 answer:
irga5000 [103]3 years ago
6 0

Answer:

Option A.

Explanation:

This is the reaction:

2Na + Cl₂ → 2NaCl

By stoichiometry, ratio is 2:2. So 2 mol of NaCl are produced by 2 moles of Na.

So the answer is 3.6 moles

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The overall reaction in a commercial heat pack can be represented as How much heat is released when 4.40 moles of iron are react
vodomira [7]

Answer:

Explanation:

The overall equation for this reaction can be represented as:4 Fe(s) + 3 O_{2(g) }  \to 2Fe_2O_{3(s)} \ \ \ \      \Delta H = -1652  \ kJ

The first question says:

How much heat is released when 4.40 moles of iron is reacted with excess O₂?

Suppose 1652 kJ of heat is being emitted into the surroundings when four(4) moles of Fe reacted with O₂, therefore;

4.40 moles of Fe reacts with:

=\dfrac{4.40 \ moles \times  1652 \ kJ}{4 \ moles}

= 1817.2 kJ of heat will be produced.

The second question says:

How much heat is released when 1.00 mole of Fe_2O_3 is produced?

Given that 1652 kJ of heat is being emitted into the surroundings when two(2) moles of Fe_2O_3 is produced, therefore;

1.00 moles of Fe_2O_3 reacts with:

=\dfrac{1.00 \ moles \times  1652 \ kJ}{2 \ moles}

= 826 kJ of heat will be produced.

To the third question; we have:

How much heat is released when 1.60 g iron is reacted with excess O₂?

We need to find the number of moles of iron first.

We know that number of moles = mass/molar mass

Thus, the molar mass of iron = 55.8 g/mol

number of moles of iron = (1.60g) / (55.8 g/mol)

number of moles of iron = 0.02867 mol

Thus; \dfrac{0.02867\  mol \times  1652 \ kJ }{4 \ mol}

= 11.84 kJ of heat is released.

The last question says:

How much heat is released when 11.8 g Fe and 1.20 g O₂ are reacted?

Again;

the number of moles of Fe = (11.8g) / (55.8 g/mol) = 0.2114 mole of Fe

Thus; \dfrac{0.2114\  mol \times  1652 \ kJ }{4 \ mol}

= 87.31 kJ of heat is released.

On the other hand,

the number of moles of O₂ = (1.20g) / (32 g/mol) = 0.0375 mol of O₂

Thus; \dfrac{0.0375\  mol \times  1652 \ kJ }{3 \ mol}

= 20.65 kJ of heat is released

Therefore, when these two(2) reactants reacted with each other, it is just the smaller amount of heat that would be released because oxygen tends to be the limiting reactant.

7 0
3 years ago
Which of the following is a mixture? steel water oxygen gold
Liula [17]

The answer is steel because you cannot pick water, oxygen, or gold out of a mixture.

8 0
3 years ago
Read 2 more answers
Write the name for the compound whose formula is shown here<br><br> Ca3(BO3) 2
4vir4ik [10]

Answer:

Calcium Nitrate

Explanation:

3 0
3 years ago
What would be your best course of action if exposed to this hazard?
Olenka [21]

Answer: Option C) Rinse the affected area with cool water for 10-15 minutes.

Explanation:

Once exposed to burns, whether chemical or heat, rinse the affected area of the body with cool water, as water is known to dissolve all burning particles attached to the skin, and cool off the blood vessels lying beneath the burned surface.

Unlike other options provided, rinsing affected area with cool water is the best first aid for skin burns

6 0
2 years ago
Which is a FALSE statement about elements?
svetlana [45]
C. Not each element has a known neutron number
6 0
3 years ago
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