The main reason to use a visual aid in a presentation is to ensure concepts are more challenging to understand.
make a challenging concept easier to understand.
guarantee that complex information is accurate.
keep an audience’s attention through distraction.

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

pie chart because it is in percents ( % )

the right answer is c i just did the question.

i think it's letter a.