When carbon burns, carbon dioxide is produced by the reaction below. If 28 L of CO2 are produced at STP, how many grams of carbon were used? C(s) + O2(g) → CO2(g)

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

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

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.