Question

calculate the mass of 0.5 mole of 02 gas​

Answer 1

Answer:

n = 0.5 mole; Molar mass(M) of oxygen = 16 x 2 = 32 g.

Since, mass of 1 mole of oxygen = 32.

So, mass of 0.5 mole = m = 0.5 x 32.

= 16 g.

Answer 2

Answer:

nitrogen gas is N2.

Molecular mass of N2 is 28 g

1 mole weighs 28g

0.5 moles weigh 14g

Explanation:

Nitrogen molecule has 2 atoms.

Atomic number of Nitrogen is 7.  Hence, Its molecular mass = 14 amu (7 protons and 7 neutrons.

1 mole of N2 gas contains Avogadro number of molecules: N = 6.022 * 10^23

mass of one molecule = 28 amu

mass of one mole of molecules of N2 = 28  gm/mol

mass of 0.5 mole of molecules of N2  at STP =  0.5 * 28 = 14 gm