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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: KH502 on April 28, 2015, 07:58:06 AM

Title: Stoichiometry question
Post by: KH502 on April 28, 2015, 07:58:06 AM

Question:

2.24 × 10^–2 dm3 of H2 was evolved (formed) when 24 mg of a bivalent metal X reacted
with an access of HCl. X was:
A. Ca
B. Sr
C. K
D. Fe
E. Mg

Is there another way to solve this without having to test randomly every element?

Thanks.

Title: Re: Stoichiometry question
Post by: Borek on April 28, 2015, 07:59:52 AM

Sure - reverse the process to estimate molar mass of the element involved.

Title: Re: Stoichiometry question
Post by: KH502 on April 29, 2015, 06:24:47 AM

Thanks! That makes sense ;D