During a lab experiment with magnesium and hydrochloric acid, curious carl observed bubbles being produced. he identified the gas as being hydrogen. the formula is: 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. 73.0 g

d. 82.6 g

From the periodic table:
molecular mass of hydrogen = 1 gram
molecular mass of chlorine = 35.5 grams

Therefore,
mass of one mole of HCl (molar mass) = 1 + 35.5 = 36.5 grams

To get mass of two moles, we will simply multiply the molar mass by 2 as follows:
mass of 2 moles of HCl = 2 x 36.5 = 73 grams

(C) 73 grams

Outermost (valence) electrons