What is the chemical formula for water

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

How many atoms are there in 5.70 mol of mg

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm