Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

Covalent network solids typically have high melting points and boiling points.

The chemical formula of a network solid indicates in the molecule by a a formula unit.

Covalent-network solid is a chemical compound (or element) in which the atoms are bonded by covalent bonds in a continuous network extending throughout the material.  

For example, SiO₂ is a covalent-network solid.

Silicon Dioxide has a high melting point, around 1700°C.

Silicon(IV) oxide has continuous three-dimensional network of SiO₂ units.

Both high and the ratio number of atoms

Explanation:

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