A 5.5 g sample of a substance contains only carbon and oxygen. Carbon makes up 35% of the mass of the substance. The rest is mad
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<u>Answer:</u>
<u>For a:</u> The number of sodium ions in given amount of sodium sulfite are
<u>For b:</u> The number of sulfite ions in given amount of sodium sulfite are
<u>For c:</u> The mass of one formula unit of sodium ions is grams
<u>Explanation:</u>
The chemical formula of sodium sulfite is . It is formed by the combination of 2 sodium
ions and 1 sulfite
ions
To calculate the number of moles, we use the equation:
Given mass of sodium sulfite = 2.80 g
Molar mass of sodium sulfite = 126 g/mol
Putting values in above equation, we get:
- <u>For a:</u>
Moles of sodium ions in sodium sulfite = (2 × 0.022) moles
According to mole concept:
1 mole of a compound contains number of particles
So, 0.022 moles of sodium sulfite will contain = number of sodium ions
Hence, the number of sodium ions in given amount of sodium sulfite are
- <u>For b:</u>
Moles of sulfite ions in sodium sulfite = (1 × 0.022) moles
According to mole concept:
1 mole of a compound contains number of particles
So, 0.022 moles of sodium sulfite will contain = number of sulfite ions
Hence, the number of sulfite ions in given amount of sodium sulfite are
- <u>For c:</u>
Molar mass of sodium sulfite = 126 g/mol
According to mole concept:
number of formula units are present in 1 mole of a compound
Or, number of formula units of sodium sulfite have a mass of 126 grams
So, 1 formula unit of sodium sulfite will have a mass of =
Hence, the mass of one formula unit of sodium ions is grams