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4. Calculate the formula weight (mass) of K2Cr2O7. -g/mole help please!!? What happens in terms of electrons when sodium reacts with bromine? YOu have a solution of .250 M NaCl. If you boil away 2/3 of the volume of water, what is the concentration of this solution? What data points do we combine to make the integrated rate law? What s is the percent yield of lead (in) nitrate and sodium iodide Pb(NO3)2 + 2 NaI = PbI2 + 2 NaNO3?