Cryolite Is a Compound Needed for the Hall-Heroult Process for Producing

question 78

Multiple Choice

Cryolite is a compound needed for the Hall-Heroult process for producing aluminum.Cryolite is produced by the following reaction:
6 HF + Al(OH) ₃ + 3 NaOH → Na₃AlF₆ + 6 H₂O
How many grams of cryolite are produced if the reaction has a 67.3% yield and a limiting reagent of 35.4 grams of NaOH?

• A)61.9 g
• B)41.7 g
• C)125 g
• D)186 g
• E)20.2 g

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Definitions:

Chemiluminescence

The emission of light (luminescence) as a result of a chemical reaction without the need for external light sources.

Mineral Sample

A physical piece of a naturally occurring solid substance with a defined chemical composition and crystalline structure.

Phosphorescence

A type of photoluminescence where a substance absorbs photons and re-emits them, resulting in a glow after the excitation source is removed.

Radioactivity

The spontaneous emission of particles or radiation from the nucleus of an unstable atom as it becomes more stable.