Chapter 1, Problem 1.18E

According to the law of conservation of mass, what is the mass of calcium, Ca, required to complete this reaction?

An atom of rhodium (RhRh) has a diameter of about  2.7×10−8cm2.7×10−8cm.   Part A: What is the radius of a rhodium atom in angstroms (ÅÅ)? Express your answer using two significant figures.   Part B: What is the radius of a rhodium atom in meters (mm)? Express your answer using two significant figures.   Part C: How many RhRh atoms would have to be placed side by side to span a distance of  2.0 μmμm ? Express your answer using two significant figures.   Part D: If the atom is assumed to be a sphere, what is the volume in m3m3 of a single RhRh atom? Express your answer using two significant figures.

Compounds are combinations of elements. The combination of those elements is specific to the compound. Some compounds have the exact same elements but in different amounts. Look at C6H12O6, which you hopefully recognize as glucose (think cellular respiration and photosynthesis. But ribose is a 5 carbon sugar and its formula is C5H10O5 which you hopefully recognize (think RNA). They both have the same elements, but have different numbers of each element (sugars all have the 1:2:1 ratio). When you're looking at a formula, it's wise to look for the capital letters. That indicates when a different element is present. For glucose, there's a capital C - carbon, a capital H - hydrogen, and a capital O - oxygen. Behind elements, the subscripts help indicate the number of each element that's present. In glucose, there are 6 carbons, 12 hydrogens, and 6 oxygens.  How many carbons, hydrogens, and oxygens does ribose have in its formula?