According to laura, the compound with the chemical name phosphorus trichloride has one atom of phosphorus and four atoms of chlorine. is she correct in saying this? explain your answer.

She is incorrect

Explanation:

According to the question the compounds name is phosphorus trichloride . Phosphorus trichloride can be simply translated as PCl3 . The tri indicates that the chlorine atom exist as 3 atom of chlorine .

phosphorus has an atomic number of 15 and chlorine has an atomic number of 17. Phosphorus has electronic configuration of 2 8 5 , that means it requires about 3 electrons to satisfy the octet rule. Chlorine has a configuration of 2 8 7. Phosphorus atom shares  electrons with the 3 atoms of chlorine. Phosphorus is covalently bonded with chlorine sharing 3 pairs of electrons.

Phosphorus trichloride PCl3 has 1 atom of phosphorus and 3 atoms of chlorine and not 4 atoms of chlorine. Laura is definitely incorrect.

emily ruth's annual premium is $1058.50

step-by-step explanation:

emily ruth is a female of 27 years age purchasing 20 year endowment insurance with face value $25000.

from the given table,

for females, the age of a male 3 years younger should be used.

so, we have to check for 24 year male for 20 year endowment.

it is 42.34 for every $1000 face value.

for a face value of $25000,

it is 25 * 42.34 = $1058.50

∴ emily ruth's annual premium is $1058.50

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.