A neutral atom has a mass that can be approximated as

CHEMISTRY · Single correct · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties

Problem

A neutral

^{40}\text{Ca}

atom has a mass that can be approximated as

40\,\text{u}

. Given

1\,\text{u}=1.66\times10^{-27}\,\text{kg}

and the electron mass

m_e=9.11\times10^{-31}\,\text{kg}

, what is the approximate ratio of the mass of a

^{40}\text{Ca}

atom to the mass of a single electron? (a)

4\times10^{4}

(b)

7\times10^{5}

(c)

7\times10^{4}

(d)

7\times10^{3}