Chemistry, 25.06.2019 00:00, henryzx900

What is the mass of 3.75 moles of nacl

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answered: robertss403

M (NaCl) = n × M = 3.75 × 58.5 =
219.375 g

M (NaCl) = 23 + 35.5 = 58.5 g/mol

answered: dimondqueen511

mass of 3.75 moles of NaCl = 219.375 grams

Explanation:

Firstly, one need to calculate the molar mass of the compound, sodium chloride. Calculating the molar mass of the compound is adding the atomic mass of each atom present in the compound.

The compound contains 1 atom of sodium and 1 atom of chlorine.

Atomic mass of Na = 23 g

Atomic mass of Cl = 35.5 g

Molar mass of the compound = 23 + 35.5 = 58.5 g per mol

1 mole of NaCl contains 58.5 g

3.75 moles will contain ?

cross multiply

mass of 3.75 moles = 3.75 × 58.5

mass of 3.75 moles of NaCl = 219.375 grams

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.

answered: Guest

the answer is option a.

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