Question

The Efficacy of Competitive Collaborative Learning to Improve Student Learning Los Angeles Harbor College (LAHC) Fall 2019 Chemistry 065 Study Guide for Exam number two (2) November 20, 2019 Name(s) Group # Circle Learning Style: VAT Chapter Eight (8) 1. Calculate the mass in grams for a single atom of the following elements: (a) beryllium, Be (b) sodium, Na (c) cobalt, Co (d) arsenic, As

Answer 1

a. The mass of Avagadro number of Be atoms (6.023*10^23 atoms) = 9.0123 gms

The mass of 1 atom Be = (9.0123/6.023*10^23) =1.496*10^-23 gms

b.

The mass of Avagadro number of Na atoms (6.023*10^23 atoms) = 22.987 gms

The mass of 1 atom Na = 22.987/(6.023*10^23) =3.816*10^-23 gms

c.

The mass of Avagadro number of Co atoms (6.023*10^23 atoms) = 63.546 gms

The mass of 1 atom Co = 63.546/(6.023*10^23) =1.05*10^-22 gms

d.

The mass of Avagadro number of As atoms (6.023*10^23 atoms) = 74.9216 gms

The mass of 1 atom As = 74.9216/(6.023*10^23) =1.24*10^-22 gms