1L=1000mL
3,331L=3,331,000mL
To go from L to mL, we can simply move the decimal 3 times to the right, as that essentially multiplies that number by 1000.
or we can solve it this way
1L 1000ml
______=________
3331L x ml
Cross multiply
3331000=1x
divide both sides by 1
3,331,000=x
Answer=3,331,000mL