Asolution has a ph of 4.20. using the relationship between ph and poh, what is the concentration of oh−? a. 9.9 × 10-1 m b. 6.2 × 10-1 m c. 6.3 × 10-5 m d. 6.7 × 10-6 m e. 1.6 × 10-10 m

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante