Arnold kept a water log as a project for his chemistry class. Arnold's family consists of Arnold, his sister, and his parents for a total family size of four. He measured each family member's water usage every day for a week, and found that the family used an average of 457 gal/day. Arnold's city charges $0.223/cgal of water. The unit centigallon (cgal) is used by cities to measure the volume of water used, where 1 cgal is equal to 100 gal. Assuming this average usage continues, how much does Arnold expect his family to pay in a year for water usage?

$ 1487.90 .

Explanation:

Family size = 4

Water usage per member = 457 gal / day .

Water usage for whole family = 457 x 4

Use of water in one year for family = 457 x 365 x 4 = 667220 gal

667220 gal = 667220 / 100 = 6672.20 cgal .

expense per cgal = $ 0.223

Total yearly expected expense = 0.223 x 6672.20

= $ 1487.90

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.

indium, and thallium have three electrons i think