a gaseous binary compound composed of hydrogen and another element has a vapor d

Question

a gaseous binary compound composed of hydrogen and another element has a vapor density that is 1.94 times that of oxygen, 1.21 grams if water is formed, removing all the hydrogen originally persent a gaseous binary compound composed of hydrogen and another element has a vapor density that is 1.94 times that of oxygen, 1.21 grams if water is formed, removing all the hydrogen originally persent a gaseous binary compound composed of hydrogen and another element has a vapor density that is 1.94 times that of oxygen, 1.21 grams if water is formed, removing all the hydrogen originally persent

Explanation / Answer

for any compound or element, molar mass = 2 X (vapor density)

the element vapor density is 1.94 times that of oxygen. oxygen vapor density is 8 then the vapor density of that element = 1.94 X 8 = 15.52 then molar mass of element = 2 X 15.52 = 31.04. so this molar mass is equal to Phosphorous molar mass. the compound may be PH3.

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