In collecting the precipitate, it is inappropriate to heat <span>the reacted mixture and evaporate off the water because it is possible that the mixture contains other substances that precipitates as well when the mixture is being heated so you will not be able to collect what you want.</span>
Because if you change the subscripts you can change the whole equestion and can get the wrong balance therefore instead of change subscripts you supports to change the coefficients and coefficients is an among of the rule in balance of chemical equestion.
Answer is: molarity of sodium hydroxide solution is 1.95 M.
m(NaOH) = 68.4 g.
n(NaOH) = m(NaOH) ÷ M(NaOH).
n(NaOH) = 68.4 g ÷ 40 g/mol.
n(NaOH) = 1.71 mol.
V(NaOH) = 875 mL ÷ 1000 mL/L = 0.875 L.
c(NaOH) = n(NaOH) ÷ V(NaOH).
c(NaOH) = 1.71 mol ÷ 0.875 L.
c(NaOH) = 1.954 mol/L.
There are 22.99073411 miles in 37 kilometers.
You would use the formula (Miles = Kilometers * 0.621371192) to get your answer.
Other calculations:
37 kilometer(s) = 40463.69 yards
37 kilometer(s) = 121391.08 feet or foot
37 kilometer(s) = 1456692.91 inches
Hope this helps! :)