The following questions involve the quantities of some materials you will be using in the calorimetry lab. Keep a copy of your answers, so you will not have to recalculate them in the lab. (a) How many moles of NH3 will you be using in Part C of the calorimetry experiment?

0.075 moles

Explanation:

 Molarity = Mass/ Molar Mass*1000/Volume(ml)

Mole = Mass/ Molar mass

Given

  Molarity = 1.50 moles/ml

  Volume = 50 ml

∴ moles = Molarity*Volume/1000

              =1.50 *50  / 1000

              =0.075 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