Please answer all three of these questions ​

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 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.