3. To find an object's mechanical energy. you add its A kinetic and potential energy B kinetic and thermal energy C potential and thermale energy D kinetic and chemical energy​

A

Explanation:

The formula for mechanical energy is mechanical energy = kinetic energy + potential energy.

it is A number 1

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