How Many Grams of Calcium Hydride Are Required to Produce

question 130

Multiple Choice

How many grams of calcium hydride are required to produce 4.56 L of hydrogen gas at 25.0 °C and 0.975 bar according to the chemical equation shown below? CaH₂(s) + 2H₂O(l) → Ca(OH) ₂(aq) + 2H₂(g)

• A) 3.77 g
• B) 7.64 g
• C) 15.3 g
• D) 45.6 g

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Definitions:

Sternum

The long flat bone in the upper middle of the front of the chest to which the ribs are attached.

Costae

The plural form of costa, referring to ribs, which are long curved bones forming the rib cage.

Xiphoid Process

A small cartilaginous projection at the lower end of the sternum, which becomes bony in older adults.

Sternal Body

The main, long part of the sternum (breastbone) to which the rib cartilage attaches.