A280. l kiln is used for vitrifying ceramics. it is currently operating at 915 ∘c , and the pressure is 1.075 atm . how many moles of air molecules are within the confines of the kiln?

3.0857 moles of air

Explanation:

For this situation, we will use the ideal gas wet: PV = nRT

⇒ with P = pressure (in atm)

⇒ with V = volume (in liter)

⇒ with n = number of moles of gas

⇒ with R = the ideal gas constant = 0.0821 L * atm * K^-1 * mol^-1

⇒ with T = the absolute temperature (in Kelvin)

  ⇒ 915 °C = 915 + 273.15 K = 1188.15 K

To calculate the number of moles of air we have to distort the formule:

n= (P*V) / (R*T)   = (1.075 atm * 280 L) / ( 0.0821 L * atm * K^-1 * mol^-1  * 1188.15 K)

n = 3.0857 moles of air

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.