Mathematical Relationships · Chemistry Reference Tables (2025 Edition)
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The Mathematical Relationships table from the Reference Tables for Physical Science: Chemistry (2025 Edition) gives three relationships and a note defining STP. The temperature and pressure rows support HS-PS1-9 (gas law calculations need kelvin, and STP is defined here); the mole row supports HS-PS1-7 and the concentration calculations in HS-PS1-10.
What the relationships table shows
Temperature. K = °C + 273.15 converts Celsius temperatures to kelvin, which is what the combined gas law needs. The 2011 edition rounded the conversion to 273; the 2025 edition uses 273.15, and the answer keys of the released questions do too (298.15 K for 25 °C).
Pressure. 1 atm = 101.3 kPa converts between the two pressure units on the exam. The 2025 tables give pressures in kilopascals and atmospheres only; there is no mm Hg or torr.
1 mole. One mole of a substance has a mass equal to its molar mass in grams (the sum of the average atomic masses from the Periodic Table of the Elements), contains 6.02 × 1023 particles (atoms, molecules, formula units or ions), and, for an ideal gas at STP, occupies 22.4 L. The first relationship is the one every mass–mole stoichiometry calculation uses; the third turns up when a gas volume is asked for (August 2026 Q3).
STP. Standard temperature and pressure is 273.15 K and 1 atm (101.3 kPa). HS-PS1-9's clarification statement allows real gases at conditions near STP.
Rows
A link or an {{Rt}} chip (Template:Rt) can point at one equation or constant with these anchors; each one lands on the table above:
temperature– K = °C + 273.15pressure– 1 atm = 101.3 kPamole– Mole relationships
Regents Exam Questions
Released Regents questions that cannot be answered without this table, listed by exam. Each link opens the question with its answer key; the standard is the one the question assesses.
| Exam | Cluster | Question | Standard | Row |
|---|---|---|---|---|
| August 2026 Chemistry Regents | Electricity Generation in New York State | Question 3 | HS-PS1-7 | Mole relationships |
| Catalytic Converter in Cars | Question 31 | HS-PS1-7 | Mole relationships | |
| Parade of Balloons | Question 42 | HS-PS1-9 | K = °C + 273.15 | |
| June 2026 Chemistry Regents | Chemistry of Beverages | Question 6 | HS-PS1-7 | Mole relationships |
| Balloon Arches | Question 24 | HS-PS1-7 | Mole relationships | |
| Balloon Arches | Question 26 | HS-PS1-9 | K = °C + 273.15 | |
| Clock Reaction | Question 32 | HS-PS1-10 | Mole relationships | |
| Chemistry sample clusters (spring 2025) | Smartphone Chemistry | Question 3 | HS-PS1-7 | Mole relationships |
| A Profitable Blueberry Field | Question 4 | HS-PS1-7 | Mole relationships |