How many moles of calcium (Ca) atoms are there in 77.4 g of Ca?

Why do mentos react to coke? Also is this a chemical or physical reaction?

Americans eat too much salt (NaCl). A healthy adult should eat no more than 6 g of salt in one day. Use this information to answer the following questions. (Round atomic masses to the nearest tenth unit.) a. What is the molar mass of NaCl? b.

If you are given distance and a period of time, what can you calcuate

An early method of producing hydrogen gas was passing steam through red-hot iron pipes according to the reaction 3 Fe (s) + 4 H2O (g) → Fe3O4 (g) + 4 H2 (g) How many liters of hydrogen gas at STP can be created by reacting 15.3 g of iron?

H4X - pKa1 = 1.5 H3X 2 - pKa2 = 3.6 H2X 3 - pKa3 = 7.8 HX 4 - pKa4 = 10.9 X 5 - pKa5 = 11.5 8.67 5.45 13.45

Calculate the [oh-] in a solution with a ph of 12.52.

Which of the following months would be the darkest at the South Pole? January December August February

The half-life of a certain radioisotope is 8 days. How much (mass) of a 80 mg sample will remain after 24 days?

BF3 type of compound

What direction do electrons flow in an electrolytic cell? A. From cathode to anode B. From anode to cathode C. Through the salt bridge D. From electrode to electrolyte