Zn + HCl --> ZnClLaTeX: _22 + HLaTeX: _22

What volume of hydrogen, at STP, is produced when 2.5 g of zinc react?

0.856 L of H2 will be produced

Explanation:

Step 1: Data given

Mass of zinc = 2.5 grams

Molar mass of zinc = 65.38 g/mol

Step 2: The balanced equation

Zn + 2HCl → ZnCl2 + H2

Step 3: Calculate moles Zn

Moles Zn = 2.5 grams .65.38 g/mol

Moles Zn = 0.0382 moles

Step 4: Calculate moles H2

For 1 mol Zn we need 2 moles HCl to produce 1 mol ZnCl2 and 1 mol H2

For 0.0382 moles Zn we'll have 0.0382 moles Zn

Step 5: Calculate volume of H2

1 mol = 22.4 L

0.0382 moles = 22.4 * 0.0382 = 0.856 L

0.856 L of H2 will be produced

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.  

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error