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Chapter 18: Q14E (page 734)

Supposeof an alkaline earth metal reacts withof water to produceof hydrogen gas at and . Identify the metal and determine of the solution.

Short Answer

Expert verified

The metal is calcium and of the solution is 12.7.

Step by step solution

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01

Definition of Molar mass

Alkaline earth metals react with water, producing hydrogen gas:

The molar mass of an unknown alkali metal can be calculated from the mass given in the exercise and the moles of metal that reacted with water. Molar mass

02

of Calculation 

We assume that all the metal reacted with the water.

Therefore, from the ratio of the moles of hydrogen gas and the moles of alkali metal, we can determine the moles of the alkali metal.

The moles of hydrogen gas that is produced can be calculated from the equation for ideal gas law.

03

Calculation of Molar mass

Molar

Molar mass

Molar mass

The calculated molar mass matches the molar ma

04

Calculation of  

is calculated according to the equation shown below.

The

ion concentration can be calculated from the ion concentration using the equation for the dissociation of water. Moles can be calculated from the ratio of moles of to moles of . ss

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Most popular questions from this chapter

The xerographic (dry writing) process was invented in 1938by C. Carlson. In xerography, an image is produced on a photoconductor by exposing it to light. Selenium is commonly used, since its conductivity increases three orders of magnitude upon exposure to light in the range from400to500nm. What color light should be used to cause selenium to become conductive? (See Figure12.3)

From the information on the temperature stability of white and gray tin given in this chapter, which form would you expect to have the more ordered structure (have the smaller positional probability)?

TheN2Omolecule is linear and polar.

  1. On the basis of this experimental evidence, which arrangement, NNO orNON, is correct? Explain your answer.
  2. On the basis of your answer in part a, write the Lewis structure ofN2O(including resonance forms). Give the formal charge on each atom and the hybridization of the central atom.
  3. How would the multiple bonding in

N≡N-O..:

be described in terms of orbitals?

Explain why HFis a weak acid, whereasHCl,HBr, and HIare all strong acids.

Although He is the second most abundant element in the universe, it is very rare on earth. Why?
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