Which element is least metallic

How many molecules are in 6.0 moles of methane

The fact that the total amount of energy in a system remains constant is a(n)

For the reaction c6h14(g) & longrightarrow; c6h6(g) + 4h2(g), δp(h2)/δt was found to be 2.5 x 10-2 atm/s, where δp(h2) is the change in pressure of hydrogen. determine δp(c6h14)/δt for this reaction at the same time.