100 grams of phosphoric acid should be produced in a laboratory. Calculate how many grams of a reactant you have to start a reaction with, if the percentage yield is 52.5%. Please show all work it would be greatly appreciated. I'm desperate and have been stuck for 2-3 hours. Plz someone help.

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Which describes fat? a: a carbohydrate that produces energy b: a nucleic acid that directs cell function c: a lipid that stores energy d: a protein that speeds up a chemical reaction

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.