Final answer:
The representation '3CH4' means there are three molecules of methane, each consisting of one carbon and four hydrogen atoms. According to Avogadro's number, this would equal to 1.8066 × 10^24 molecules of CH4.
Step-by-step explanation:
When asked 'how much molecules does 3CH4 have?', we're discussing the quantity of methane molecules represented by the chemical formula '3CH4'. Each 'CH4' represents one molecule of methane, so '3CH4' indicates three molecules of methane. Given that one mole of any substance contains 6.022 × 1023 molecules, as defined by Avogadro's number, '3CH4' would have 3 × 6.022 × 1023 = 1.8066 × 1024 molecules of methane (CH4).