Calculate the number of GRAMS of carbon dioxide (CO2) produced when 100 grams of methane (CH4) are completely burned in oxygen (O2).

To calculate the number of grams of carbon dioxide (CO2) produced when 100 grams of methane (CH4) are completely burned in oxygen (O2), you need to follow these steps:

1. Write and balance the chemical equation for the combustion of methane:
CH4 + 2O2 → CO2 + 2H2O

2. Calculate the molar mass of methane (CH4) and carbon dioxide (CO2):
Molar mass of CH4 = (1 carbon atom * atomic mass of carbon) + (4 hydrogen atoms * atomic mass of hydrogen)
Molar mass of CO2 = (1 carbon atom * atomic mass of carbon) + (2 oxygen atoms * atomic mass of oxygen)

You can find the atomic masses from the periodic table:
Atomic mass of carbon (C) = 12.01 g/mol
Atomic mass of hydrogen (H) = 1.008 g/mol
Atomic mass of oxygen (O) = 16.00 g/mol

3. Convert the given mass of methane (CH4) to moles using its molar mass:
Moles of CH4 = (mass of CH4 / molar mass of CH4)

4. Use the balanced equation to determine the stoichiometric ratio between CH4 and CO2. From the balanced equation, you can see that 1 mole of CH4 produces 1 mole of CO2.

5. Multiply the moles of CH4 by the stoichiometric ratio to obtain the moles of CO2 produced:
Moles of CO2 = (moles of CH4 * stoichiometric ratio of CO2)

6. Convert the moles of CO2 to grams using the molar mass of CO2:
Mass of CO2 = (moles of CO2 * molar mass of CO2)

Remember to perform the calculations using the appropriate significant figures and rounding rules as per your requirements.

CH4 + 2O2 ==> CO3 + 2H2O

mols CH4 = grams/molar mass
Using the coefficients in the balanced equation convert mols CH4 to mols CO2
Now convert mols CO2 to grams. g = mols x molar mass.