287.2L
Explanation:
Given parameters:
Mass of sodium peroxide = 1000g = 1kg
Unknown
volume of oxygen produced at STP
Solution:
At standard temperatue and pressure STP;
Number of moles = 
molar mass of Na₂O₂ = (2 x 23) + (2 x 16 ) = 78g/mol
Number of moles = 
= 12.82mole
To solve this problem, we need to write the equation of the reaction since this is a decomposition reaction;
Na₂O₂ → 2Na + O₂
The unknown is the volume of oxygen that would be produced at STP
Volume of gas at STP = number of moles x 22.4
From the equation;
1 mole of Na₂O₂ produced 1 mole of O₂ gas
12.82mole will produce 12.82mole of oxygen gas
Now, the volume of gas at STP = 12.82 x 22.4 = 287.2L
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Answer:
yes it rotates on its own axis
Explanation:
rotation is the movement/spinning of the earth on its own axis
revolution is the movement of the earth around the sun
What are the possible answers?
In this case, according to the given information about the oxidation numbers anf the compounds given, it turns out possible to figure out the oxidation number of manganese in both MnI2, manganese (II) iodide and MnO2, manganese (IV) oxide, by using the concept of charge balance.
Thus, we can define the oxidation state of iodine and oxygen as -1 and -2, respectively, since the former needs one electron to complete the octet and the latter, two of them.
Next, we can write the following 
, since manganese has five oxidation states, and it is necessary to calculate the appropriate ones:
Next, we multiply each anion's oxidation number by the subscript, to obtain the following:
Thus, the correct choice is Manganese has an oxidation number of +2 in Mnl2 and +4 in MnO2.
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