Answer:
The number of mole of the unknown metal is 3.58×10¯³ mole
Step-by-step explanation:
We'll begin by calculating the number of mole hydrogen gas, H2 that will occupy 80.3 mL at stp.
This is illustrated below:
Recall:
1 mole of any occupy 22.4L or 22400 mL at stp.
1 mole of H2 occupies 22400 mL at stp.
Therefore, Xmol of H2 will occupy 80.3 mL at stp i.e
Xmol of H2 = 80.3/22400
Xmol of H2 = 3.58×10¯³ mole
Therefore, 3.58×10¯³ mole of Hydrogen gas was released.
Now, we can determine the mole of the unknown metal as follow:
The balanced equation for the reaction is given below:
X + 2HCl —> XCl2 + H2
From the balanced equation above,
1 mole of the unknown metal reacted to produce 1 mole of H2.
Therefore, 3.58×10¯³ mole of the unknown metal will also react to produce 3.58×10¯³ mole of H2.
Therefore, the number of mole of the unknown compound is 3.58×10¯³ mole.