A Mixture of Nitrogen and Hydrogen Was Allowed to Come

question 56

Multiple Choice

A mixture of nitrogen and hydrogen was allowed to come to equilibrium at a given temperature.
3H₂ + N₂ 2NH₃
An analysis of the mixture at equilibrium revealed 2.1 mol N₂,3.2 mol H₂,and 1.8 mol NH₃.How many moles of H₂ were present at the beginning of the reaction?

• A) 3.2
• B) 4.8
• C) 5.0
• D) 5.9
• E) 4.4

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Definitions:

Exponential Smoothing

A forecasting technique that applies decreasing weights to past observations as they recede in time.

Exponential Smoothing Model

A time series forecasting technique that applies weighting factors which decrease exponentially to past observations.

Mean Absolute Percentage Error

A measure used in statistics to assess the accuracy of a forecast or prediction, calculated as the average of absolute percentages of errors between predicted and observed values.

Smoothing Constant

A smoothing constant is a parameter in exponential smoothing used to control the level of smoothing applied to a time series.