How much energy does it take to boil 100 mL of water? (Refer to table of constants for water.)
A. 100 mL x
1 g
х
1 mL
1 mol
18.02 g
x 40.65 kJ/mol = 226 kJ
B. 100 mL x
1 g
1 mL
X
1 mol
18.02 g
(-285.83 kJ)/mol = –1586 kJ
C. 100 mL x
1 g
X
1 mol
18.02 g
x 4.186 kJ/mol = 23.2 kJ
1 mL
1 g
D. 100 mL x
1 mL
1 mol
x
18 02 g
x 6.03 kJ/mol = 33.5 kJ

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.