H2SO4 + Na2CO3 --> Na2SO4 + H2O + CO2 In a titration where H2SO4 is added from a buret to an aqueous solution of 0.850 g Na2CO3, 46.75 mL of H2SO4 are needed to reach the permanent endpoint of the titration.

A) Find the number of moles of Na2CO3 in the reaction.

B) Find the number of moles of H2SO4 in the reaction.

C) Find the mass/mass % of H2SO4 based on the above information about reaching the endpoint of the titration.

The molar mass of Na2CO3 is 105.99 g/mol. The molar mass of H2SO4 is 98.08 g/mol. The density of H2SO4 is 0.985 g/mL.

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table?