Hydrocarbons are organic compounds that are made up of only carbon and hydrogen atoms. A hydrocarbon was found to contain 84.63% of carbon by mass. Determine the empirical and the molecular formula of this hydrocarbon if 0.471 g of its vapour occupies a volume of 268 cm3 at 18 °C and 101 kPa

What material does not melt at any temperature

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false