91影视

1. Total number of atoms of arsenic,$N=7.50脳{10}^{24}$
2. Molar mass,$\begin{array}{c}M=74.9\frac{\text{g}}{\text{mol}}\\ =74.9脳{10}^{鈭�3}\frac{\text{kg}}{\text{mol}}\end{array}$
3. 础惫辞驳补诲谤辞鈥檚狈耻尘产别谤,$N_A=6.02脳{10}^{23}\text{permol}$.

By using Equation 19-4 for the mass of each atom, we calculate the total mass of the arsenic atom in kilograms. A mole is related to mass by the equation${\mathbf{mN}}_A$.

The formula is as follows:

$M=m{N}_A$

Here, m isthe mass of each atom, M is the molar mass and$N_A$ is Avogadro鈥檚number

According to Equation19-4, M is molar mass and $N_A$is the Avogadro鈥檚number (constant).

$M=m{N}_A$

where m is the mass of each atom. By rearranging the given equation, we have

$m=\frac{M}{N_A}$

For N atoms

$m=\frac{NM}{N_A}$

By substituting the given value, the total mass is

$m=\frac{7.50脳{10}^{24}脳74.9脳{10}^{鈭�3}}{6.02脳{10}^{23}}$

$m=0.933\text{鈥塳驳}$

Hence, the mass in kilograms of $7.5脳{10}^{24}$atoms of arsenicis 0.933 kg.