Question

find the number of moles in 7g of Na

Answer 1

Na = Sodium

Given mass of Sodium = 7 grams

Molar mass = 23 grams


No: of moles = Given mass / Molar mass
= 7 /23
= 0.304 moles (approx.)



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Answer 2

Given: 7 grams of Na is given

To find: Number of moles in this sample

Solution: Let the given mass of Na be m.

m = 7 grams

Atomic mass is the mass of a single atom of a given metal.

Here, Na is the metal sodium. The atomic mass of sodium is 23.

The formula for finding moles in a given samole is given by the formula:

Given mass / Atomic mass

= m/ Atomic mass

= 7/23

= 0.304 moles

Therefore, 7 grams of sodium contains 0.304 moles of sodium.