## Chemistry 12th Edition

Published by McGraw-Hill Education

# Chapter 8 - Periodic Relationships Among the Elements - Questions & Problems - Page 366: 8.138

#### Answer

The element, X is Carbon (C).

#### Work Step by Step

The colorless crystalline allotrope of Carbon is Diamond. Carbon reacts with excess oxygen to form $CO_{2(g)}$. $CO_{2(g)}$ reacts with water to form carbonic acid ($H_{2}CO_{3(aq)})$.

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