which has maximum number of molecules among 7 gram of nitrogen, 16 gram of NO2 16 gram of oxygen and 2 gram of hydrogen​

2 g of H₂

Explanation:

We have:

7 g of N₂

16 g of NO₂

16 g of O₂

2 g of H₂

Let's count to verify the moles:

7 g . 1 mol / 28g = 0.25 moles of nitrogen

16 g . 1 mol / 46g = 0.348 moles of nitrogen dioxide

16 g . 1mol /32g = 0.5 moles

2 g . 1 mol / 2g = 1 mol

The biggest number of moles is in the hydrogen.

1 mol of anything contains NA particles

1 mol of oxygen contains 6.02×10²³ molecules, the maximun number

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

all eukaryotic cell have mitochondria : )