Can someone help me with this, what even is this? I didn't even learn this

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

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

What is the formula of the ionic compound composed of calcium cations and chloride anions