If a sample of nitrogen gas (n2) contains 6.0 × 1024 atoms of nitrogen, then about how many moles of nitrogen gas are in the sample 3.0 1.0 5.0 2.5

One mole of any substance contains Avogadro's number of atoms.
This means that one mole of nitrogen contains 6.022 * 10^23 atoms.

To know the number of moles containing 6 * 10^24 atoms, all you have to do is cross multiplication as follows:
number of moles = (6*10^24 *1) / (6.022*10^23) = 9.963 moles which is approximately 10 moles

Since one nitrogen molecule has two nitrogen atoms, therefore, the sample has 10/2 = 5 moles of nitrogen molecules

Hbr dissociates to form h+ and br-ca(oh)2 dissociates to form ca2+ and 2oh-the h+ and oh- react to form waterassuming the reactants are dissolved in water, the net reaction is h+ + oh- —> h2oif you’re asked to show all components of the reaction, the complete reaction is 2hbr + ca(oh)2 —> cabr2 + 2h2o