WILL MARK BRAINLIEST!! PLEASE HELP!
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

Using the balanced combustion equation you have written, it can be seen that for every mole of methane burned, one mole of carbon dioxide is produced. Thus, if 150 moles of carbon dioxide are produced, 150 moles of methane are being used.

Now, we need to convert that to grams. Using the molecular weight of methane as 16.0425 g/mol:

(16.0425 g/mol) * (150 mol) = 2,406.375 grams of methane

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