How many moles of Sr2+ are present in 250 mL of a 0.45 M solution of strontium phosphide?

Moles of Sr²⁺ = 0.3375

Further explanation

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

So to find the number of moles can be expressed as

Strontium phosphide (Sr₃P₂)

Sr₃P₂ ⇒ 3Sr ²⁺ + 2P³⁻

mol of Sr₃P₂

mol of Sr ²⁺

mol ratio Sr₃P₂ : Sr ²⁺ = 1 : 3

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

The correct answer would be b) volume versus temperature, because they are also directly proportional.