Question

16.The substance which has a formula mass of
133.5 amu is
a) MgCl2
b) szcie
c) BCI2
d) AICI​

Answer 1

The substance which has a formula mass of 133.5 amu is..

1. MgCl2
2. SiCl2
3. BCl2
4. AlCl3

solution : atomic mass of Mg = 24 amu

atomic mass of Cl = 35.5 amu

atomic mass of Si = 28 amu

atomic mass of B = 10.8 amu

atomic mass of Al = 27 amu

now, formula mass of MgCl2 = atomic mass of Mg + 2 × atomic mass of Cl

= 24 + 35.5 × 2

= 24 + 71

= 95 amu

similarly, formula mass of SiCl2 = 28 amu + 2 × 35.5 amu = 28 amu + 71 amu = 99 amu

formula mass of BCl2 = 10.8 amu + 2 × 35.5 amu

= 10.8 amu + 71 amu = 81.8 amu

formula mass of AlCl3 = 27 amu + 3 × 35.5 amu

= 27 amu + 106.5 amu

= 133.5 amu

Here it clear that formula mass of Aluminium chloride is 133.5 amu

Answer 2

Answer:

133.5

Hope it help you

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