Question

How many moles are in 2.372e+02 mg (milligrams) of bromic acid?

Answer 1

Answer:

1.840 x 10⁻³ mol HBrO₃

Explanation:

To find the moles of bromic acid (HBrO₃), you should (1) convert milligrams to grams (by dividing by 1,000) and then (2) convert moles to grams (via molar mass from periodic table).

Molar Mass (HBrO₃): 1.008 g/mol + 79.904 g/mol + 3(15.998 g/mol)

Molar Mass (HBrO₃): 128.906 g/mol

2.372 x 10² mg HBrO₃         1 g                1 mole
---------------------------------x----------------x------------------  = 1.840 x 10⁻³ mol HBrO₃
                                         1,000 mg      128.906 g