Investigators have found black and smokeless powder at the scene of a crime involving a fire. What is the BEST way for the investigators to analyze this evidence?

Iknow #2 is d. i just need to know why

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

In a reaction (at equilibrium) that makes more moles of gas than it consumes, what is the effect of increasing the pressure?