Which expression gives the mass percent of carbon in methanoic (formic) acid, hcooh? 12/29 x 10012/46 x 1002/46 x 10016/46 x 100

The expression that gives the mass percent of carbon in HCOOH, is 12/46 x 100

Explanation:

Mass of carbon = 12 g/m

Mass of formic acid = 46 g/m

You pick the element's mass, and you divide between, the total mass.

When you do x100,  you have the percent.

(Mass of carbon / Total mass) . 100

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)