# Homework 75

- Page ID
- 29258

## 11.67

A photon which has a wave length of 0.875nm strikes a surface. The emitted electron has a kinteic energy of 900eV. Calculate the binging energy of the electron in kJ/mol.

Solution:

First we must change our value in units of eV to jules using the conversion 1eV=1.602x10^{-19}J

This gives us a value of 1.4418x10^{-16}J

## 3.78

Hydrogen gas is collected over water at 35C at a total pressure of 745 mmHg. What is the partial pressure of the hydrogen gas collected? Given that the total volume of the gas collected is 750ml, calculate the mass of the hydrogen gas collected.