Chemistry, 29.07.2019 21:00 nyaa70

How many molecules (not moles) of nh3 are produced from 5.81×10−4 g of h2? express your answer numerically as the number of molecules?

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The reaction of formation of NH₃ is as follows;
N₂ + 3H₂ ---> 2NH₃
the stoichiometry of H₂ to NH₃ is 3:2
for every 3 moles of H₂ that reacts, 2 moles of NH₃ are produced
the mass of H₂ that has been used up = 5.81 x 10⁻⁴ g
molar mass of H₂ = 2 g/mol
number of H₂ moles that were used up = 5.81 x 10⁻⁴ g/ 2 g/mol
= 2.905 x 10⁻⁴ mol
for every 3 mol of H₂ used up - 2 moles of NH₃
for every 1 mol of H₂ used up - 2/3 moles of NH₃
therefore for 2.905 x 10⁻⁴ mol of H₂ = 2/3 x 2.905 x 10⁻⁴ mol
number of NH₃ moles produced = 1.94 x 10⁻⁴ mol
number of NH₃ molecules in 1 mole = 6.022 x 10²³ molecules
therefore in 1.94 x 10⁻⁴ mol = 6.022 x 10²³ molecules/mole x 1.94 x 10⁻⁴ mol

therefore number of NH₃ molecules produced = 1.168 x 10²⁰ NH₃ molecules

Answer from: Quest

i dont know

explanation:

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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