Chemistry, 11.07.2019 23:20, yoongnzl

You are performing an experiment in a lab to attempt a new method of producing pure elements from
compounds. the only problem is that you do not know what element will form. by your previous calculations
you know that you will have 6.3 moles of product. when it is complete, you weigh it and determine you have
604.4 grams. what element have you produced?

Answers: 1

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Answers

answered: travisvb

Molybdenum

Explanation:

Since, the atomic mass of the elements is a characteristic property of the elements, you can use the data given, number of moles and mass in grams of the product, to calculate the atomic mass of the product, and then compare with the atomic masses of the elements (information foun in any periodic table).

1) Atomic mass of the product:

Atomic mass = mass in grams / number of molesAtomic mass = 604.4 g / 6.3 mol = 95.94 g/mol ≈ 94.9 g/mol (rounded to three significant figures)

2) Periodic table:

Molybdenum, Mo, the element with atomic number 42, has atomic mass equal to 95.94 g/mol.

3) Conclusion:

So, you can conclude safely that the element you have produced is Molybdenum.

answered: Guest

l dont know l am s sorry

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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You are performing an experiment in a lab to attempt a new method of producing pure elements from