When the volume of a gas is changed from 250 ml to 425 ml, the temperature will change from 137 c to

When the volume of a gas is changed from 250 mL to 425 mL, the temperature will change from 137° C. What is temperature 2? Using Charles law

T2=697K

Explanation:

Set up the formula and identify data as provided in the problem. 

V1T2=V2T1
where:

V1=250ml
V2=425ml
T1=137oC
T2=?−

Make sure to convert 137oC→K. This is the most important point to remember because the volume of a fixed mass of a given gas is directly proportional to the temperature expressed in K; not C; i.e.,
137oC→?−K
K=⋅oC+273
K=137+273=410

P₄(s) + 5 O₂(g) ⇒ P₄O₁₀(s)

P₄O₁₀(s) + 6 H₂O(l) ⇒ 4 H₃PO₄(aq)

P₄(s) + 5 O₂(g) + 6 H₂O(l) ⇒ 4 H₃PO₄(aq)

Explanation:

The electric furnace method for the synthesis of phosphoric acid has 2 steps. In the first step, elemental phosphorus (P₄) is burned in air to form P₄O₁₀. The balanced reaction is:

P₄(s) + 5 O₂(g) ⇒ P₄O₁₀(s)

In the second step, P₄O₁₀ reacts with water to give phosphoric acid.

P₄O₁₀(s) + 6 H₂O(l) ⇒ 4 H₃PO₄(aq)

If we add both steps, we get the global reaction.

P₄(s) + 5 O₂(g) + 6 H₂O(l) ⇒ 4 H₃PO₄(aq)