Which of the following processes will determine the number of atoms in a sample?
2 answers:
Answer: multiplying the number of moles of the sample by avagadro's number
Explanation: According to Avogadro's law, 1 mole atoms of a substance consists of avogadro's number of atoms and weighs equal to its molecular mass.
Thus 1 mole atom of a substance has = atoms
x moles atom of a substance has ==
atoms
Dividing the mass of the sample by its molar mass gives us the number of moles.
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Answer:
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here iron is having an oxidation state of +3 called as cation and oxide
is an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral
.
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.
