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Atomic Mass and Atomic Mass Unit

How many mole...

Question

How many moles are there in 34.5 g of sodium ? (Atomic mass of Na = 23 u)

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Solution

Mass of sodium = 34.5g
We know that 1 mole of sodium weighs 23g.
Therefore, 34.5g of sodium = 34.5 / 23 = 1.5 moles
Hence, 34.5g of sodium contain 1.5 moles of sodium.

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Similar questions

Q. How many mole are there in

34.5 g

of sodium ? (Atomic mass of

N a = 23 u

Q. How many atoms are contained in

23 g

N a = 23 u

Q. What is the mass of 5 moles of sodium carbonate (Na₂CO₃) ?
(Atomic masses : Na = 23 u ; C = 12 u ; O = 16 u)

Q. Sodium bicarbonate breaks down on heating:

2 N a H C O_{3} \to N a_{2} C O_{3} + H_{2} O + C O_{2}

(Atomic mass of

N a = 23, C = 12, H = 1, O = 16)

i) How many moles of sodium bi carbonate are there in the equation?
ii) What is the mass of sodium bicarbonate used in this equation?
iii) How many moles of carbon dioxide are there in this equation?

Q. How many moles of sodium atoms are present in 69 grams of sodium (Na)?

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