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Andrew [12]
3 years ago
8

Balance the following reaction. A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coeffici

ent is "1". KNO3 → KNO2 + O2
Chemistry
2 answers:
Roman55 [17]3 years ago
5 0
2KNO3 -> 2KNO2 + O2. Hope this helps!
zalisa [80]3 years ago
5 0

Answer: 2KNO_3\rightarrow 2KNO_2+O_2

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced equation will be:

2KNO_3\rightarrow 2KNO_2+O_2

The atoms on reactant and product side must be same.

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Ivan
Molarity = moles of solute/volume of solution in liters.

The solute here is NaCl, of which we have 46.5 g. To calculate the molarity of an NaCl solution, we need to know the number of moles of NaCl. To convert from grams to moles, we divide the mass by the molar mass of NaCl. The molar mass of NaCl is the sum of the atomic masses of Na and Cl: 23 amu + 35 amu = 58 amu. For our purposes, we can regard amu as equivalent to grams/mole.

(46.5 g)/(58 g/mol) = 0.8017 moles NaCl.

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