Curious carl and his lab partner were conducting a variety of experiments to produce gases: hydrogen, oxygen, and carbon dioxide. in one experiment, they added a piece of magnesium ribbon to 10 milliliters of hydrochloric acid. they observed bubbles being produced and did a variety of tests to identify the escaping gas; it proved to be hydrogen. the reaction is represented by the following equation:
mg + 2hcl → mgcl2 + h2(g)

what is the mass, in grams, of two moles of hcl?
a) 18.3 g
b) 36.5 g
c) 72.0 g
d) 73.0 g

73.0 grams is the mass of two moles of HCl.

Explanation:

Moles of HCl = 2 moles

Molar mass of HCl = 36.5 g/mol

n = number of moles

m = Mass of the given compound

M = molar mass of the compound

m =

73.0 grams is the mass of two moles of HCl.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

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