A powder contains benzoic acid mixed with starch. A student finds that a 2.505 g sample of this powder requires 35.2 mL of a 0.102M sodium hydroxide solution for the acid to be neutralized. What is the percent by mass of benzoic acid in the powder? Use the correct number of significant figures and do not include units (or percent sign) or your answer will be counted wrong.

What is important to study for nios grade 12 chemistry? i have only one month left.

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

Which formula can be used to calculate the molar mass of hydrogen peroxide