The equivalent mass of nitrogen in nitrogen pentoxide is :-(A). 14(B). 28(C). 2.8(D). 4.66

The molecular formula of nitrogen pentoxide is N2O5. To find the equivalent mass of nitrogen in nitrogen pentoxide, you need to determine how many grams of nitrogen are present in one mole of N2O5.

The molar mass of N2O5 can be calculated as follows:

Two moles of nitrogen (N) atoms have a molar mass of 2 * 14.01 g/mol (approximately, since the atomic mass of nitrogen is around 14.01 u).
Five moles of oxygen (O) atoms have a molar mass of 5 * 16.00 g/mol (approximately, since the atomic mass of oxygen is around 16.00 u).
So, the molar mass of N2O5 is approximately 2 * 14.01 g/mol + 5 * 16.00 g/mol = 28.02 g/mol.

Now, to find the equivalent mass of nitrogen in N2O5, you simply divide the molar mass by the number of moles of nitrogen present in one mole of N2O5 (which is 2 moles of nitrogen):

Equivalent mass of nitrogen in N2O5 = Molar mass of N2O5 / Moles of nitrogen in N2O5
Equivalent mass of nitrogen in N2O5 = 28.02 g/mol / 2 moles
Equivalent mass of nitrogen in N2O5 = 14.01 g/mol

So, the equivalent mass of nitrogen in nitrogen pentoxide (N2O5) is approximately 14.01 g/mol. Therefore, the correct answer is (A) 14.