Question

The molar mass of glucose is 180.18 grams per mole. Which of the following is the molecular formula of glucose?

Answer 1

C6H12O6 6 carbon 12 hydrogen 6 oxygen

Answer 2

Answer: C) C6H12O6

Explanation: The molar mass is the mass of a given substance (chemical element or chemical compound (in grams.) divided by its amount of substance (in mole). To determine which of the given options is the molecular formula of glucose, we need to calculate the molar mass of each one of  them, and compare them with the given value (180.18 grams per mole):

molar mass of the elements:

C=12

H=1

O=16

A) mCHO=12+1+16=29 g/mol

B) mC3H4O3=12*3+1*4+16*3=88g/mol

C) mC6H12O6=12*6+1*12+16*6=180g/mol

D) mC12H24O12=12*12+1*24+16*12=360g/mol

As we can see, the correct answer is option C.