Which of the following reaction is favored by low pressure? a. H2 + I2 ⇌ 2HI. c. N2 + 3H2 ⇌ 2NH3
b. PCl5 ⇌ PCl3 + Cl2 d. N2 + O2 ⇌ 2NO​

Explanation:

Dissociation of Phosphorus pentachloride requires low pressure as it releases energy (i.e, exothermic reaction takes place) ∆n>0.

c. orbital shape i hope this is correct

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.