What is the reading of the thermometer (to the correct # of sig figs) in °F, °C, °K

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

Ill give u brainliest pls how is mass of carbon conserved during cellular respiration

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ