Wednesday
April 1, 2015

Homework Help: Chemistry

Posted by Sandy on Thursday, December 13, 2012 at 1:56am.

When 0.40 g of impure zinc reacted with an excess of hydrochloric acid, 127 mL of hydrogen was collected over water at 10 degress C The external pressure was 737.7 Torr.

a) What volume would the dry hydrogen occupy at 1.00 atm and 298 K ?

b) What amount (in moles) of H2 was collected?

c) What is the percentage purity of the zinc, assuming that all the zinc present reacted completely with HCl and that the impurities did not react with HCl to produce hydrogen? The vapor pressure of water at 10 degrees C is 9.21 Torr.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

AP Chemistry - A mixture of aluminum and zinc metal is used in 2 experiments ...
chemistry - A 0.0677 g sample of magnesium metal reacted with excess ...
AP Chemistry - Small quantities of hydrogen gas can be prepared in the ...
Chemistry - A mixture of chromium and zinc weighing .362 g was reacted with an ...
Chemistry - A sample of iron reacted with hydrochloric acid. The liberated ...
Chemistry - In an experiment, 238 mL of 0.45 molar hydrochloric acid completely ...
chem 3A - please help me with these homework problems from chemistry because the...
AP Chemistry - A mixture of aluminum and zinc metal is used in 2 experiments ...
Chemistry - A 0.0677g sample of magnesium metal reacted with excess hydrochloric...
AP Chem - a 4.22 gram sample of copper II sulfide was added to excess ...

Members