A student demonstrates the reaction by mixing 25.00 g of H2SO4 with 25.00 g of CaCO3. Calculate the theoretical mass of the excess reactant.

Soon after mixing the reactants, the student determines that 33.17 g of CaSO4 was produced by the reaction. Is this a reasonable result? Show calculations to defend your answer.

The first two questions were about the number of moles of each reactant the student mixed and which is the limiting reactant. I got 2.55x10^-1 mol H2SO4 and approximately 2.5x10^-1 mol CaCO3, and that the limiting reactant is CaCO3. I'm pretty sure of these answers but I got stuck with the second two questions.

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Answerhorizontal;

You need to figure out at which x-value does the graph has a tangent line slope of -1.remember, the derivative is the slope of the tangent line. so find the derivative function and set it to equal -1 to find the x-value that will have a tangent line slope of 0.differentiate with the chain rule.    set the derivative to equal -1 and solve for x.      take log base 10 of both sides. also recall that  .    so the x-coord of the point of tangency is .the y-coordinate of this point of tangency can be calculated using the original function:     using point-slope form, the equation of the tangent line is      the x-intercept of this tangent line is when the graph is at y=0.    this rounds off to  .choice c.