How many molecules of Hydrogen gas are present? A 0.250-g sample of a magnesium-

Question

How many molecules of Hydrogen gas are present?

A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HC1(aq). When the liberated H2(g) is collected over water at 29 degree C and 752 torr, the volume is found to be 309mL . The vapor pressure of water at 29 degree C is 30.0 torr. Part C Taking into account the vapor pressure of water, how many moles of hydrogen gas, n, are present in 309mL at 752 torr and 29 degree C? The value of the gas constant R is 0.08206 L ? atm/(mol ? K). You may also find the conversion factors1 atm = 760 torr and TK = Te + 273 useful. Express the number of moles to three significant figures. n= mol

Explanation / Answer

PV =NRT

752*.309/.08321*302*760 = n

n= .121moles

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