A chemist weighed out 8.08 g of calcium. Calculate the number of moles of calcium she weighed out. Be sure your answer has the correct number of significant digits.​

2h2s + 3o2 2so2 + 2h2o which option gives the correct mole ratios? h2s: so2 = 2: 2 and o2: h2o = 3: 2 h2s: so2 = 2: 3 and o2: h2o = 3: 2 h2s: so2 = 4: 4 and o2: h2o = 5: 4 h2s: so2 = 4: 6 and o2: h2o = 4: 4

How have the greenhouse gasses increased from the year 2000 to 2018

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?