How many moles of KBr are present in a 13.2 g sample of KBr?

10-2 moles

Explanation:

recall: volume * concentration = mass (moles in our case)

First, let's simplify our units

200 mL = 0.2 L

0.111 M = 0.111 moles/L

now use the above equation for mass:

0.2 L * (0.111 moles/L) = 0.0222 moles or 2.22 * 10-2 moles

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

c.

explanation: