A solution of NaNO3 contains 38.0g of NaNO3 in 85.0g water. What is the mass percent of NaNO3 in the solution? Select the correct answer below:

4.47%
44.7%
3.09%
30.9%

Agas is contained in a thick walled balloon when the pressure changes from 1.21 atm to 2.52 the volume changes from 3.75 l to 1.72 l and the temperature change from 293k to blank k

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?