Areaction of 0.028 g of magnesium with excess hydrochloric acid generated 31.0 ml of hydrogen gas. the gas was collected by water displacement in a 22 °c water bath. the barometric pressure in the lab that day was 746 mm hg. use dalton's law to calculate the partial pressure of hydrogen gas in the gas-collecting tube.

Answer :  The partial pressure of is, 726.2 mmHg

Solution :

According to the Dalton's law, the total pressure of the gas is equal to the sum of the partial pressure of the mixture of gasses.

where,

= total partial pressure = barometric pressure = 746 mmHg

= partial pressure of hydrogen gas = ?

= partial pressure of water vapor = 19.8 mmHg  (assume)

Now put all the given values is expression, we get the partial pressure of the hydrogen gas.

Therefore, the partial pressure of is, 726.2 mmHg

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.