the mass of a an atom of helium is 6.65 x 10^(-24). use scientific notation to express the mass of 250…

the mass of a an atom of helium is 6.65 x 10^(-24). use scientific notation to express the mass of 250 helium atoms.\na 1.6625 x 10^(-21)\nb 1.6625 x 10^(-22)\nc 1.6625 x 10^(-24)\nd 1.6625 x 10^(-26)\ne 1.6625 x 10^(-27)

the mass of a an atom of helium is 6.65 x 10^(-24). use scientific notation to express the mass of 250 helium atoms.\na 1.6625 x 10^(-21)\nb 1.6625 x 10^(-22)\nc 1.6625 x 10^(-24)\nd 1.6625 x 10^(-26)\ne 1.6625 x 10^(-27)

Answer

Explanation:

Step1: Multiply the mass of one atom by the number of atoms

$6.65\times 10^{-24}\times250$ First, calculate $6.65\times250 = 1662.5$. So the expression becomes $1662.5\times 10^{-24}$.

Step2: Convert to proper scientific - notation

$1662.5\times 10^{-24}=1.6625\times10^{3}\times 10^{-24}$ Using the rule of exponents $a^{m}\times a^{n}=a^{m + n}$, we have $1.6625\times10^{3+( - 24)}=1.6625\times 10^{-21}$.

Answer:

A. $1.6625\times 10^{-21}$