Table 1: Gas Collection Data for Mg and HCI Reaction Mass Mg (g) 0.040 g Volume HCl (mL) 10.00 mL Concentration HCI 1.00 mol/L (mol/L) Atmospheric Pressure 14.50 psi ( Temp Air (°C) 21.0 Temp Water (°C) 22.5 Volume of Gas (mL) 17.20

Constants Periodic Table Consider the following reaction: If the initial volume of the H2O2 solution is 3.2 L, what total amount of O2 (in moles) is formed in the first 20 s of reaction? Hint: Use Figure 1 to answer this problem. H2O2(aq) H20() + ½ O2(g) and the kinetics plots below to answer the questions to the right. Express your answer in moles to two significant figures. O 1.4 mol Figure 1. Plot of [H,O,] vs time O .8 mol 0.9 0.63 mol 0.8 0.7 O 0.70 mol 0.6 0.5 0.4 Submit Request Answer 0.3 0.2 0.1 Part B 20 40 60 80 time (s) concentration of H;O2 (mol L²)

I don’t fully understand how to calculate dilution schemes like this.

Consider the neutralization reaction   2HNO3(aq)+Ba(OH)2(aq)⟶2H2O(l)+Ba(NO3)2(aq)2HNO3(aq)+Ba(OH)2(aq)⟶2H2O(l)+Ba(NO3)2(aq)   A 0.110 L0.110 L sample of an unknown HNO3HNO3 solution required 54.5 mL54.5 mL of 0.250 M Ba(OH)20.250 M Ba(OH)2 for complete neutralization. What is the concentration of the HNO3HNO3 solution?