1) Calcula a massa molecular das seguintes substâncias: Dados: MA - Na = 23 u; Cl =35,5 u; K = 39 u; H = 1 u; S = 32 u e O = 16 u
a) NaCl
b) KCl
c) NaOH
d) HCl
e) H 2SO 4
f) H 2O2) São dadas as seguintes substâncias: café C 8H 10N 4O 2

Ibeg i need 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?

Will give brainliest it is a lab from k12 here is the linkfor each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. type your answer here. (score for question 3: of 5 points) were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. type your answer here. (score for question 4: of 5 points) make a general statement about the reactivity of the metals in this experiment. type your answer here.

In 2002, the rare earth elements mine in mountain pass, california was closed because