Chlorine is widely used to purify municipal water supplies and to treat swimming pool waters. suppose that the volume of a particular sample of cl2 gas is 8.80 l at 895 torr and 25 ∘c. at what pressure will the volume equal 5.90 l if the temperature is 56 ∘c?

1474.0 torr.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant.

T is the temperature of the gas in K.

P₁V₁T₂ = P₂V₂T₁

P₁ = 895.0 torr, V₁ = 8.8 L, T₁ = 25°C + 273 = 298 K.

P₂ = ??? torr, V₂ = 5.9 L, T₂ = 56°C + 273 = 329 K.

∴ P₂ = P₁V₁T₂/V₂T₁ = (895.0 torr)(8.8 L)(329 K)/(5.9 L)(298 K) = 1474.0 torr.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.