Chemistry, 02.08.2019 00:30 laura52677

Atire at 21°c has a pressure of 0.82 atm. its temperature decreases to –3.5°c. if there is no volume change in the tire, what is the pressure after the temperature change? use mc006-1.jpg. 0.75 atm 0.89 atm 1.1 atm 1.3 atm

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Answer from: rd1369

0.75 atm. is the answer

Answer from: aaliyahnv07

Answer will be 0.75 atm .

According to gas law given by Gay lussac-

"pressure of a gas is directly proportional to the temperature(kelvins) of the gas when volume is kept constant".

$\frac{P_1}{T_1}=\frac{P_2}{T_2}$

given:

$P_{1}=0.82 atm$

$T_{1}=21^{\circ}C=21+273.15K=294.15K$

$P_{2}=?$

$T_{2}=-3.5^{\circ}C=-3.5+273.15K=269.65K$

Now putting the respective values is the equation (1)

$\frac{P_1}{T_1}=\frac{P_2}{T_2}$

$\frac{0.82}{294.15}=\frac{P_2}{269.65}$

$P_{2} = 0.75 atm$

Answer from: Quest

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –

6.022

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,

will have a gram-molecular weight of 352g.

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

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Atire at 21°c has a pressure of 0.82 atm. its temperature decreases to –3.5°c. if there is no volume...