HELP PLS I NEED HELP ASAP Chemical reactions occur around us every day. Combustion of hydrocarbons releases the carbon stored in fossil fuels (e. g. coal, oil, natural gases) into the atmosphere as carbon dioxide gas. Which of the following equations represent this process?

A. C4H10+ O2→CO2+ H2O

B. CO2+ H2O →C6H12O6+ O2

C. CaCO3+ HNO3→Ca(NO3)2+ H2O + CO2

D. NaHCO3+ HC2H3O2→NaC2H3O2+ H2O + CO2

he would use the colour black

since electrons are negative the answer is neagtaive

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.