PLEASE HELP!!! Consider the following acid/base reaction CO2−3 + 2 H+ → H2O + CO2 that produces CO2 gas. 7.8 L of CO2 is
collected at STP. What is the molarity of the HCl solution used in the reaction if 123 mL of HCl was needed?
Answer in units of M.

Scientists often deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each of these numbers in an alternate form.