The balanced chemical equation for the combustion of butane (C4H10) is:

2C4H10 + 13O2 —> 8CO2 + 10H20

Explanation:

When butane undergo Combustion, CO2 and H20 are produced as shown below:

C4H10 + O2 —> CO2 + H20

A clear observation of the above equation proved it is unbalanced. Now let us balance the equation. This is illustrated below:

C4H10 + O2 —> CO2 + H20

There 4 atoms of C on the left side of the equation and 1atom on the right side. It can be balance by putting 4 in front of CO2 as shown below:

C4H10 + O2 —> 4CO2 + H20

There are 10 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 5 in front of H2O as shown below:

C4H10 + O2 —> 4CO2 + 5H20

Now, there are a total of 13 atoms of O on the right side and 2 atoms on the left. It can be balance by putting 13/2 in front of O2 as shown below:

C4H10 + 13/2O2 —> 4CO2 + 5H20

Now multiply through by 2 to clear the fraction

2C4H10 + 13O2 —> 8CO2 + 10H20

Now the equation is balanced.

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms