1. What is the meaning of Avogadro's number? A. number of grams per one mole of a substance

B. simplest whole-number ratio of a chemical formula

C. whole number ratio that is a multiple of a chemical formula

D. set number of particles in one mole of a substance

answer; blank (1); /// (2)///(3)///highblank(4)//low;

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter  

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.

yes the answer is total mass in unchanged   : )