Hydrogen sulfide gas burns in oxygen to produce sulfur dioxide and water vapor. 2H2S(g) + 302(g) 2502(g) + 2H2O(g)
What mass of oxygen gas is consumed in a reaction that produces 4.60mol SO2?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?