(8pts) Part 1 - Density of Unknown Liquid Calculate the average density of the unknown liquid
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Table 4. Mass determination of unknown liquid
Trial 1
Trial 2
Trial 3
Volume of unknown
10.0
10.0
10.0
Mass of empty beaker
42.01
42.94
41.90
Mass of beaker + unknown
49.88
50.80
49.74
Mass unknown (9)
0.787
0.786
0.784
(2pts) Average mass (9)
0.786

Can someone me with questions 15 to 17 plz.

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1