Final answer:
The pressure values of an acetylene cylinder cannot be determined without additional context. The Ideal Gas Law and stoichiometry are used to solve related problems.
Step-by-step explanation:
The question pertains to the pressure of an acetylene cylinder. The pressure values mentioned are 2175 kPa, 250 psi and 15000 kPa. However without knowing the context or the conditions under which these pressures are measured, such as temperature or the amount of gas in the cylinder, it is not possible to determine which pressure value is correct. Usually, the pressure of a gas in a cylinder is defined by the conditions stated on the cylinder itself or within a given problem scenario.
For the exercise mentioned it is important to use the Ideal Gas Law combined with stoichiometric ratios, to solve for the number of required oxygen tanks.