Divide 100mg by 50mg/mL to find how much you need to prepare:
\(\displaystyle{100}{m}\frac{{g}}{{{50}{m}\frac{{g}}{{m}}{L}}}={2}{m}{L}\)

Question

asked 2021-08-12

asked 2021-05-30

A chemist needs 150 milliliters of a 54% solution but has only 10% and 70% solutions available. How many milliliters of each should be mixed to get the desired solution?

asked 2020-10-23

asked 2021-06-10

Here’s an interesting challenge you can give to a friend. Hold a $1 (or larger!) bill by an upper corner. Have a friend prepare to pinch a lower corner, putting her fingers near but not touching the bill. Tell her to try to catch the bill when you drop it by simply closing her fingers. This seems like it should be easy, but it’s not. After she sees that you have released the bill, it will take her about 0.25 s to react and close her fingers-which is not fast enough to catch the bill. How much time does it take for the bill to fall beyond her grasp? The length of a bill is 16 cm.