Bra + light NBS CC Br or Br 2

I need help with this general chemistry questions please.

The speed of light is 2.998x10^8/ms . How long does it take light to travel 90.cm? Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols. time=

Which purity of IPA has a higher density, 70% or 99%?

Using the mass of the protonfrom Table 2.1 and assuming its diameter is 1.0 * 10-15 m,calculate the density of a proton in g>cm3.

Which molecules are enantiomers? Which molecules are the same? (A). H Br

An electric current of 481.0 mA transports 530. uC of charge. Calculate the time this took. Be sure your answer has the correct unit symbol and 3 significant digits. 0 x10 X H 8 S

n + Сизон

A student calibrated a eudiometer by first recording the mass of the empty eudiometer followed by filling the eudiometer to the 50.00 mL line with deionized water at 22°C and recorded the mass. The mass of water was 49.012 g. In an experiment run at 22°C, a reading from the eudiometer of 46.78 mL corresponds to what true volume?

Convert 360 KBq/cm2 to mCi/in2