1. Calculate the enthalpy of solution for the unknown salt in terms of kJ/g of the unknown salt. Don't forget to show all your work and include formulas, units, and proper significant digits with your answer. Make sure your solution is organized and easy to

Balance thechemical equation _CaCl2 (aq) + _Na2CO3 (aq) ------->_CaCO3 (s) + _NaCl (aq) Identify type ofreaction   _NaCl (aq) + _AgNO3 (aq) -------->_NaNO3(aq) + _Agcl (s) Identify type ofreaction

B) Find the normality of a solution that can be made by dissolving 2.8 g. of CaCl, in 250 ml of water. (Atomic weights for Ca is 20 and for Cl is 35) C) A compound of iron and oxygen is analyzed and found to contain 69.94% iron and 30.06% oxygen. Find the empirical formula of the compound. (Where the atomic weight of O is 16 and for Fe is 55.85).

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Here is a graph of the molarity of ethanol C2H5OH in a reaction vessel during a certain chemical reaction. Use this graph to answer the questions in the table below.

Using molarity to find solute mass and solution volume g 3/5 A chemist adds 105.0 mL of a 0.721M barium chloride (BaCl₂) solution to a reaction flask. Calculate the mass in grams of barium chloride the chemist has added to the flask. Round your answer to 3 significant digits. Ś Uyen Kha "...

Page of 2 + ZOOM 1. Balance these equations. a. Al(s)+O2(g)¬→Al½O3(s) b. N2(g)+H2(g)→NH;(g) c. C,H6(1)+O2(g)→H2O(1)+CO2(g) 2. Balance the following equations. а. СаС2(8)+Н-О() --Са(ОН)2(s)+СH-(g) b. (NH4)2Cr2O7(s)→Cr2O3(s)+N2(g)+H2O(g) c. CH;NH2(g)+02(g)→CO2(g)+N2(g)+H2O(g) 3. An explosive whose chemical formula is C;H,N6O6 produces water, carbon dioxide, and nitrogen gas when detonated in oxygen. Write the chemical equation for the detonation reaction of this explosive. 4. A number of compounds are used in cement, and reactions among them occur when water is added. In one, CaO reacts with Al2O3 and water to form Ca3Al2(OH)12. Write a balanced chemical equation for this process. 5. Ethanol, C2H5OH, is found in gasoline blends used in many parts of North America. Write a balanced chemical equation for the combustion of C2H5OH to form CO2 and H2O. 6. Balance the following equations. a. reaction to produce "superphosphate" fertilizer: Ca3(PO4)2(s)+H2SO:(aq)→Ca(H,PO4)2(aq)+CaSO4(s) b.…

For the following questions (Q1-Q5), consider the compound tartrazine (Yellow 5 food dye) that has a chemical formula of C16H9N4Na3O9S2. Ana weighs out 0.1328 g of tartrazine powder on the balance for her experiment and makes a stock solution by dissolving her powder in 500.0 mL of solution.   Q1. Determine the number of moles of tartrazine that Ana weighed out.   Q2. Find the molarity (mol/L) of Ana’s tartrazine solution.   Q3. Ana makes 5 tartrazine standards by diluting her solution and measures their absorbances using a spectrophotometer:   Concentration (µM or µmol/L) Absorbance 0.00 0.001 9.94 0.252 19.9 0.506 29.8 0.738 39.8 1.018     slope (m): 0.02534 1/(µM) y-intercept (b): -0.0009147   Q4. Calculate the molar extinction coefficient (molar absorptivity) of tartrazine in units of 1/(M·cm). Assume a cuvette path length of 1.00 cm.   Q5. If Ana determines the absorbance of an unknown tartrazine sample to be 0.662, what is the concentration…

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A physician prescribed dimenhydrinate (Dramamine) 50 mg q4-6 h. p.o. as an antihistamine. The drug is available in 0.2 g tablets. Calculate how many tablets are to be given.