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19. Intext problems: Calculation based on number of moles from mass and volume I

1.Calculate the number of moles in $46$ $g$ of sodium.

Data:

Given mass of sodium

$= 46$

$g$

Atomic mass or mass number of sodium

$=$

Formula:

The formula to find the number of moles from the mass is,

Number of moles = Mass of the element/Atomic mass of the element
Number of moles = Atomic mass of the element*Mass of the element
Number of moles = Atomic mass of the element/Mass of the element

Solution:

By substituting the values in the above formula, we get,

Number of moles

$=$

2. Calculate the number of moles in $5.6$ $L$ of oxygen at STP.

Data:

Given volume of oxygen

$= 5.6$

$L$

Molar volume of oxygen at STP

$=$

Formula:

The formula to find the number of moles from the volume is,

Number of moles = Given volume of oxygen at STP/Molar volume at STP
Number of moles = Molar volume at STP/Given volume of oxygen at STP
Number of moles = Given volume of oxygen at STP*Molar volume at STP

Solution:

By substituting the values in the above formula, we get,

Number of moles

$=$

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