Conductivity, heat is transferred better through metal than any other material
Three significant figures would be 45.0 since it would end with the nine so you look at the next digit to see if you round up or it remains the same. It is greater than five so round up to zero. This makes the ones place also go up so the answer is 45.0 The zero after the decimal counts as a significant figure.
Methane (CH4) and oxygen (O2) react to produce carbon dioxide (CO2) and water (H2O). CH4 and O2 are the reactants, while CO2 and H2O are the products.