Determine the number of moles of arsenic in 1.90 g of As.

What is the mass of one molecule of barium hexafluorosilicate $(BaSiF_6)$? A. $1.68 \times 10^{26}$ g. B. $2.16 \times 10^{21}$ g. C. $4.64 \times 10^{-22}$ g. D. $6.02 \times 10^{-23}$ g.

Write the integral as a sum of integrals without absolute values and evaluate.

$$\int _ { 0 } ^ { \pi } | \cos x | d x$$

Write the integral as a sum of integrals without absolute values and evaluate.

$$\int _ { 0 } ^ { \pi } | \cos x | d x$$

Zinc (Zn) is used to form a corrosion-inhibiting surface on galvanized steel. Determine the number of Zn atoms in 2.50 mol of Zn.

Evaluate

$$\lim _ { N \rightarrow \infty } \frac { 1 } { N } \sum _ { j = 1 } ^ { N } \sqrt { 1 - \left( \frac { j } { N } \right) ^ { 2 } }$$

by interpreting it as the area of part of a familiar geometric figure.

Evaluate

$$\lim _ { N \rightarrow \infty } \frac { 1 } { N } \sum _ { j = 1 } ^ { N } \sqrt { 1 - \left( \frac { j } { N } \right) ^ { 2 } }$$

by interpreting it as the area of part of a familiar geometric figure.