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

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

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