If 208.4 mL of N 2 bubbles have a pressure of 250.2 kPa at 203.2 K, what would their volume be at STP

What is the percent by mass of oxygen in fe2o3

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

Rays from the sun are not considered matter true or false