Express $2.53\times {10}^{-4}$ in standard notation

Q. $\frac{24.23\times 1.423\times 34.21}{521.3\times 413.32\times 2.53}$ is same is

Q. At what external pressure will water boil ${140}^{\circ }C$? (S VP at ${140}^{\circ }C$ =2710 mmHg)

Q. Find the boiling point of a solution of 5.00 g of naphthalene $\left(C_{10}{H}_8\right)$ in 100 g of benzene. $K_b$ of benzene = 2.53${}^o$C/m; the normal boiling point of benzene = 80${}^o$C.

Q. Alicia saves 10 dollars per month. Express her savings of 10 months in exponent notation.

Q. At what external pressure will water boil ${140}^{\circ }C$? (S VP at ${140}^{\circ }C$ =2710 mmHg)