Chemistry, 29.01.2020 09:51, officialrogerfp3gf2s

What is the mass of 5.31×1021 platinum atoms?

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answered: cooljariel11

1.72 g

Explanation:

1) The atomic mass of an element is the mass of one mole of atoms.

2) One mole of atoms is 6.022×10²³ atoms (Avogadro's number).

3) The atomic mass of platinum is 195.078 grams / mole (from a periodic table)

4) Formulas:

number of moles = number of atoms / 6.022×10²³

mass in grams = number of moles × atomic mass

5) Calculations:

number of moles = 5.31×10²¹ atoms / 6.022×10²³ atoms/mole = 0.00882 moles

mass in grams = 0.08882 mol × 195.078 g/mol = 1.72 g

answered: Guest

If the water vapor content stays the same and the temperature drops, then the relative humidity increases. its vise versa.if the water vapor content stats the same and the temperature rises, the relative humidity decreases. so, yes, i'd say that temperature and humidity have a strong relationship.

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.

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