Calculate the number of moles in:

1)6g of C

2) 48g of Mg

3) 8g of O2

4) 170g of NH3

1) 72 mole

2)1152 mole

3)256 mole

4) 2890 mole

Explanation:

very important for u

number of mole= given mass/molecular mass

symbolically : n= m/Mm

1) first atomic mass (carbon =12)

n=6gram × 12gram /mole

n=72mole

2) atomic mass (Magnesium =24)

48 gram × 24 gram /mole

n= 1152 mole

3)atomic mass (oxygen = 16×2=32

n= 8 gram × 32 gram/ mole

n= 256mole

4) atomic mass ( Nitrogen =14 , hydrogen = 1×3

14+3=17

n= 170 gram × 17 gram / mole.

n= 2890 mole

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