Question

What mass of hydrochloric acid is needed to
decompose 50 g of limestone?
(a) 36.5 g
(b) 73 g
(c) 50 g
(d) 100 g​

Answer 1

Answer:

36.5 g

Explanation:

Chemical reaction involved is:

CCaCO+2HCl→CaCl 2+H2O+CO2

Molar mass of CaCO3 = 40+12+16×3=100 g

Molar mass of HCl=1+35.5=36.5 g

According to the balanced reaction 100 g of CaCO3

requires 2×36.5=73 g of HCl

∴50 g CaCO3

requires:100

73×50=36.5 g HCl

Hence, option A is correct.