# What is the amount of hydrogen released in the following case:Silicon steel is an alloy of the elements iron, carbon and silicon. An alloy sample was reacted with excess hydrochloric acid and the...

What is the amount of hydrogen released in the following case:

Silicon steel is an alloy of the elements iron, carbon and silicon. An alloy sample was reacted with excess hydrochloric acid and the following reaction occurred:

Fe (s) + 2HCl (aq) ---> FeCl2 (aq) + H2 (g)

The carbon and silicon in the alloy did not react with the acid. If an alloy sample with a mass of 0.160 g produced 62.0 mL of hydrogen gas, measured at SLC, calculate the amount of hydrogen evolved in the reaction.

justaguide | College Teacher | (Level 2) Distinguished Educator

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When a sample of silicon steel that is made up of iron, carbon and silicon is reacted with excess hydrochloric acid the following reaction occurs:

Fe (s) + 2HCl (aq) ---> FeCl2 (aq) + H2 (g)

The mass of the sample used is 0.16 g and the volume of hydrogen produced when measured at standard laboratory conditions with a temperature of 25 C and a pressure of 1 atm. is 62 mL

The amount of hydrogen released can be calculated using the ideal gas law, PV = n*RT, where P is the pressure, V is the volume, n is the amount of the gas in moles, T is the temperature and R is a constant.

1*62 = n*82.05746*298

=> n = 2.53*10^-3 moles.

The amount of hydrogen produced is 2.53*10^-2 moles.