Will mark ! 1) natural gas is mostly methane, ch4. when 6.64 grams of methane is burned in the chemical reaction shown below, how many grams of water vapor are produced? ch4(g) + 2o2(g) →co2(g) + 2h2o(g) 2) how many moles of h3po4 are produced when 3.90 g p4o10 reacts completely to form h3po4? p4o10(s) + 6h2o(l) → 4h3po4(aq) your answer should include 2 places behind the decimal. 3) mercury can be obtained by reacting mercury(ii) sulfide with calcium oxide. how many grams of calcium oxide are needed to produce 134.4 g of hg? 4hgs(s) + 4cao(s) → 4hg(l) + 3cas(s) + caso4(s) round your answer to one place behind the decimal 4) the equation below shows the decomposition of lead nitrate. how many grams of oxygen are produced when 5.24 g no2 is formed? 2pb(no3)2(s) → 2pbo(s) + 4no2(g) + o2(g) record your answer to 2 places behind the decimal