1.
What is the mass number of an isotope of tin that has 66 neutrons and 50
protons?

Explanation:

To find the mass number of an isotope, add the number of neutrons and protons.

There are 66 neutrons and 50 protons in the this isotope of tin.

Add 66 and 50.

The mass number of this tin isotope is 116.

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

can you attach the