When 83.3 grams of phosphorus pentachloride react with an excess of water, as shown in the unbalanced chemical equation below, how many moles of hydrochloric acid will be produced? pcl5 + h2o yields h3po4 + hcl 0.4 moles 1.0 moles 1.6 moles 2.0 moles

The answer is 2 moles of HCl

Explanation:

To solve we have to adjust the equation:

PCl5 + 4H2O = 5HCl + H3PO4

we calculate the molecular weights of the compounds using the periodic table:

P = 30.97 g/mol

Cl = 5x35.45 = 177.25 g/mol

H = 1 g/mol

PCl5 = 30.97+177.25 = 208.22 g/mol

HCl =1+35.45 = 36.45 g/mol

we use a rule of three to calculate the mass of hydrochloric acid that forms when the 83.3 phosphorus pentachloride reacts:

208.22 g PCl5182.25 g HCl

83.3 g PCl5X g HCl

Clearing the X, we have:

X g HCl = (83.3x182.25)/208.22 = 72.91 g HCl

we calculate the moles of hydrochloric acid:

Moles of HCl = 72.91/36.45 = 2 moles of HCl

answer: h+ its less than oh

explanation:

- 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