Write the balanced equation and determine the information requested in each of the following. 1. The number of moles and the mass of water formed by the combustion of 20.0kg of acetylene, C2H2,in an excess of oxygen.

2. Limestone, caco3,dissolves in hydrochloric acid, Hcl, to form calcium chloride, carbon dioxide, and water. How many moles of Hcl are required to dissolve 2.6mol of caco3? How many moles of water are formed?
3.aluminiumoxide reacts with sulphuric acid to form aluminiumsulfate and water

A. how many moles of H2SO4 are required to react with 2.6mol of Al2O3

B. How many moles of Al2(So4)3 are formed?

See explanation.

Explanation:

Hello!

In this case, we can proceed as follows:

1. Here, the undergoing chemical reaction is:

Thus, the moles and mass of water turn out:

2. Here, the undergoing chemical reaction is:

So the required moles of HCl and the yielded of water are:

3. Here, the undergoing chemical reaction is:

Now, we apply each mole ratio obtain:

A.

B.

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assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

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 have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration 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 and should be highlighted as well.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.