1.

Mass of the following "element" // "compound" is given in grams. Calculate it.s moles and number of "molecules"//"atoms" : 46 g sodium (Na)

Answer»

Solution :Number of moles of 46 g Na = `("mass of sodium")/("ATOMIC mass of sodium")`
= `(46)/(23)`
= 2 mole
Number of molecules in 46 g sodium (Na) = `"Number of moles of Na" xx "AVOGADRO number"`
`= 2" mole" xx 6.023 xx 10^(23) "molecules"// "mole"`
= `12.046 xx 10^(23)` molecules
`~~ 1.205 xx 10^(24)` molecules


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