How many moles are present in a.12g of Nitrogen molecule.

b. the following particles of oxygen

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(a) There are 0.428 moles present in 12 g of molecule.

(b) There are 2 moles present in particles of oxygen.

Explanation:

(a). The mass of nitrogen molecule is given as 12 g.

As the molar mass of is 28 g/mol so its number of moles are calculated as follows.

So, there are 0.428 moles present in 12 g of molecule.

(b). According to the mole concept, 1 mole of every substance contains atoms.

Therefore, moles present in particles are calculated as follows.

So, there are 2 moles present in particles of oxygen.

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

the answer to your question is c.

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