With 3g of a monoprotic weak base, 50ml of a solution is made. 15ml of this solution is titrated with a 0.1M nitric acid solution. the equivalence point of this titration is reached after adding 35ml of the nitric acid solution. The pH at the equivalence point is 4.7. calculate the basicity constant of the unknown weak base. Assume volumes are additive.

I need help with questions 1-11? Could you briefly explain which answer you got for each question?

46 gr sodium (Na) reacts with excess HCl aqueous solution according to the reaction: 2Na (s) + 2HCI(aq) → 2NaC1 (aq) + H2 According to this; which of the followings is wrong? (Na:23 21 - g/mol, ClI:35.5 g/mol, H:1 g/mol) O A) 2 gr H2 is produced B) 58.5 gr NaCl is formed O C) To consume all sodium, 2 moles of HCl is needed. D) Na atoms ionize in HCl aqueous solution. O E) 2 moles NaCl is formed

(4) Ag20, NH4OH H.

3b. An impure sample of ammonium dichromate [ (NH4)2Cr207] was analyzed to determine its purity [ %(m/m) of ammonium dichromate]. a. A 1.4325 gram sample of the impure (NH4)2Cr207 was heated and decomposed in the following (unbalanced equation) reaction: • Balance the chemical equation: [ Select ] (NH4)2Cr2O7(s) [ Select ] N2(g) [ Select ] H20(L) + + [ Select ] | Cr2O3(s) b. The decomposition of the 1.4325 g of the impure sample produces 0.1252 liters of nitrogen gas (N2(g) that were collected at a temperature of 24.7°C and a pressure of 1.032 atmospheres: o Calculate the number of moles of nitrogen (N2(g)) collected in this reaction: [ Select ] mol N2 • Calculate the mass of the ammonium dichromate [ (NH4)2Cr20, ] in the sample (1.4325 g): [ Select ] g (NH4)2Cr2O7 o Calculate the %(m/m) of the ammonium dichromate in the impure sample: [ Select ] %(m/m) (NH4)2Cr2O7

2 2 X. Fo fff O-S-CH3 01S1O 0-S-CH3 F OTS CH3NH DMSO Br DMF Br EtOH CH3NH DMSO Yor + Br - Br X -S-CH3 -S-CH3 NHCH3 + OTS OP NHCH3 + F

Moquie $0 219 OWLV2 keAssignment/takeCovalentActivity.do?locator-assignment-take In the following equation for a chemical reaction, the notation (s), (I), or (g) indicates whether the substance indicated is in the solid, liquid, or gaseous state. 2SO₂(g) + O₂(g) →→→2SO3(g) + energy The reaction is Q Search Identify each of the following as a product or a reactant: SO3(g) SO₂(g) 0₂(g) When the reaction takes place energy is Submit Answer 7 L M te OWLv2 | Online teaching and X * Use the References to access important values if needed for this question. Retry Entire Group K CO 144 www.yo up 8 more group attempts remaining L 11 b Answered: For the reaction 2 x + 111 P g P¹ ins prt sc. delete Previous backspace ^ GG 4 home GURN lock 7 home A 6:52 PM 5/14/2023 74 X In

You have a 11.5 mg sample of blood that contains various proteins. Hemoglobin is the only protein in the sample containing Fe. Hemoglobin contains 3.83% by mass of a compound called heme (C₃₄H₃₂FeN₄O₄, MW = 616.49 g/mol). You find that your 11.5 mg blood sample contains 34.9 micrograms of Fe. What is the mass percent of hemoglobin in your protein sample?   -don't prematureley round