What is carbon role in chemical bonding with hydrogen

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

The diagram shows the relationship between scientific disciplines. the names of some scientific disciplines have been removed from the boxes. which scientific discipline belongs in the blue box? a. physics b. biology c. chemistry d. metallurgy

Rank the four gases (air, exhaled air, gas produced from from decomposition of h2o2, gas from decomposition of nahco3) in order of increasing concentration of co2