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