Hi this is my first question ever how many moles of NaCl are in 79 moles of NaCl?

how many moles of CO2 are in 55 liters of CO2

How many atoms of Ca are in 92 grams of Ca

i will name the brainliest please i need this before 8pm EST

A) the enthralling of formation for pure element in its standard state is always positivehope this : )

A.(nh4)(2co3)is the correct answer 

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

I'm sorry i cant you if you don't list the elements : (