How many atoms are there in 43.9g of na?

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

What two factors can affect the properties of a hydrocarbon? a. the number of its carbon atoms and the number of single bonds b. the number of its carbon atoms and the arrangement of its atoms c. the arrangement of its atoms and the number of its double bonds