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kompoz [17]
3 years ago
8

GIVING 40 POINTS PLEASE ANSWER NEED IN 5 MINS

Chemistry
2 answers:
elena-s [515]3 years ago
8 0

Answer:

B

Explanation:

bc it is B

Stolb23 [73]3 years ago
3 0
The answer would be<span>:
B</span>. <span>It is positive because the enthalpy of the products is greater than the enthalpy of the reactants.

The endothermic reaction has a positive enthalpy change because it absorbs the energy of the system. Since the product of the reaction has a greater enthalpy than the reactant, the reaction needs to take the extra energy from the system. Since the system losing energy, the surrounding temperature will drop.</span>
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4 Na + O2 → 2 Na2O<br><br> 6.79 moles of O2 will react to form how many moles of Na2O?
Nataly_w [17]

Answer:

13.94moles of Na₂O

Explanation:

The balanced reaction expression is given as:

        4Na  +  O₂  →   2Na₂O

Given parameters:

Number of moles of O₂ = 6.97moles

Unknown:

Number of moles of Na₂O

Solution:

 To solve this problem;

            1 mole of O₂  will produce 2 moles of Na₂O ;

            6.97 moles of O₂ will produce 6.97 x 2  = 13.94moles of Na₂O

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