Methane is a compound which is 75% carbon, by mass, the balance being hydrogen. if a sample of methane weighs 24 g, what mass of hydrogen does it contain?

The mass  of hydrogen  is 6 grams

calculation

step 1: find the % of hydrogen

= total %(100) - % of carbon (75%)

= 100- 75 =25%

step2: find the mass of hydrogen  from its %

that is 25/100 of 24 grams = 6 grams

false

because it does not have the potential to be entirely used up

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error