confuzzled

at the school carnival reva sees a 6-l jar filled with marbles. the person who comes closest to guessing the number of marbles wins a bike. reva tries an expeirment and finds that 70 marbles can be placed in 250-ml cup. how many marbles should she guess a...

Express 2.5M NaCl as a percent solution. what is the molar concentration of a 10% NaCl solution?

What is the molarity of a solution of sucrose that has a density of 1.24g/ml and a molecular weight of 342.3g/mol

thanks angel. i got this too

have absolutly no idea

ik im late but really, is the answer 2 ???