Question

Using conversions and data in the chapter. determine the number of hydrogen atoms required to obtain $1.0kg$ of hydrogen. A hydrogen atom has a mass of $1.0u$.

Answer 1

As we know,

Equation $1-9$ gives (to very high precision!) the conversion fro atomic mass units to kilogram. Since this problem deals with the ratio of total mass $\left(1.0kg\right)$ divided by the mass of one atom ($1.0u$ but converted to kilogram), then the computation reduces to simply taking the reciprocal of the number given in Eq $1-9$ and rounding off approximately. Thus, the answer is $6.0\times {10}^{26}$