1. Consider that 250. mL of H2 gas was produced at a pressure of 1.0 atm and a temperature of 25oC (NOT STP conditions!). How many moles of HCl reacted? Mg(s) + 2 HCl(aq) H2 (g) + MgCl2(aq) 2. How many grams of propane (C3H8) will react with 3.29 L of O2 at 1.05 atm and -34˚C?

Identify one disadvantage to each of the following models of electron configuration: dot structures arrow and line diagrams written electron configurations type in your answer below.

Which best describes how johannes kepler developed his laws of planetary motion

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