52.13 g + 1.7502 g someone help pls this is chemistry

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

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

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate