Answer: 2Na+2H2O------>2NaOH+H2
b) From the equation two moles of sodium gave one mole of hydrogen.
At stp the volume of hydrogen is 22400cm3.
The molar mass of sodium is 23
So we have
2molesNa--->1moleH2
5.76moles--->? mole H2
Meaning
2(23)Na----> 22400cm3 ofH2
5.67Na---->?H2
22400×5.67÷ 2(23)
127008÷46=2761.04cm3
Sorry I can't do the last one.
If it completely changes into something new it would be considered a physical change. Also because you wouldn't be able to change It back into its previous form.
The bond angle in a tetrahedral molecule is 109.50 DEGREE.
Bond angle refers to the molecular geometry that is formed as a result of the three dimensional arrangement of the atoms that constitute a molecule. An example of a compound that has tetrahedral shape and angle is ammonium ion.