3. predict whether each of the following molecules is polar or non-polar: a) if, b) cs2, c) so3, d) pcl3, e) sf6, f) if5

a) IF = polar

b) CS2 = non-polar

c) SO3 = non-polar

d) PCl3 = polar

e) SF6 = non-polar (bonds are polar, but the molecule is non-polar, since the                                                                                                                                    net dipole moment is zero)

f) IF5 = polar

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2