Chemistry, 11.07.2019 04:50 Anonymouslizard

What mass of precipitate will form if 1.50 l of highly concentrated pb(clo3)2 is mixed with 0.350 l of 0.170 m nai? assume the reaction goes to completion.

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Answer from: anggar20

13.7 g The balanced formula is: Pb(ClO3)2(aq)+2NaI(aq) ==> PbI2(s) + 2NaClO3(aq) The number of moles of NaI we have is the volume of fluid multiplied by the molarity so 0.350 * 0.170 = 0.0595 moles Since the NaI is the limiting reactant, for every two moles used, we'll produce 1 mole of precipitate. So 0.0595 mole / 2 = 0.02975 mole Now we need to calculate the molar mass of PbI2. Looking up the atomic weights Atomic weight Lead = 207.2 Atomic weight iodine = 126.90447 Molar mass PbI2 = 207.2 + 2 * 126.90447 = 461.00894 g/mol Now multiply the molar mass by the number of moles we have. 461.00894 g/mol * 0.02975 mol = 13.71501597 g Rounded to 3 significant figures, the answer is 13.7 g

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.

Answer from: Quest

Carbon based or cells?

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What mass of precipitate will form if 1.50 l of highly concentrated pb(clo3)2 is mixed with 0.350 l...

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