Chemistry, 09.11.2019 05:31, elijahlylejamez45

Ammonia is produced commercially by the direct reaction of the elements. the formation of 1.00 moles of gaseous nh3 by this reaction releases 46.17 kj of heat. how much energy (in kj) is released, when 28.0 kg of hydrogen gas, h2, reacts in excess nitrogen gas, n2?

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answered: jennifer2129

$4.28\times 10^{5}kJ$ of heat energy will be released

Explanation:

Balanced reaction-

$\frac{3}{2}H_{2}+\frac{1}{2}N_{2}\rightarrow NH_{3}$

According to balanced equation, $\frac{3}{2}$ moles of $H_{2}$ produces 1 mol of $NH_{3}$ to release 46.17 kJ of heat.

Molar mass of $H_{2}$ = 2.016 g/mol

Number of moles = (mass)/(molar mass)

So, 28 kg of $H_{2}$ = 28000 g of $H_{2}$

= $\frac{28000}{2.016}$ moles of $H_{2}$

= $1.389\times 10^{4}$ moles of $H_{2}$

So. $1.389\times 10^{4}$ moles of $H_{2}$ react to release $(\frac{2}{3})\times (46.17)\times (1.389\times 10^{4})kJ$ heat or $4.28\times 10^{5}kJ$ of heat

answered: Guest

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of rain or snow. this dry air produces a rain shadow.

answered: Guest

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.