I have a tank of oxygen (O2) gas that is used for hospital patients. It has 695 liters of oxygen. How many moles of oxygen is this?

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery

Which of the following best supports the concept that genetic information is passed on to offspring from both of their parents, not just one?