Get college assignment help at uniessay writers Suppose 6.50g of CH4 is allowed to burn in the presence of 3.5g of oxygen. How much (in grams) CH4, CO2 and H2O remain after the reaction is complete?
CH2NO2‾ what are all the possible lewis structures?
A 30.5 g sample of an alloy at 94.0°C is placed into 48.7 g water at 20.3°C in an insulated coffee cup. The heat capacity of the coffee cup (without the water) is 9.2 J/K. If the final temperature of the system is 31.1°C, what is the specific heat capacity of the alloy? (c of water is 4.184 J/g×K)
2 NaHCO3(s) Na2CO3(s) CO2(g) H2O(g) Heating a 1.7184-g sample of impure NaHCO3 gives 0.196 g of CO2. What was the mass percent of NaHCO3 in the original 1.7184-g sample?
A student mixes four reagents together, thinking that the solution will neutralize each other. The solutions mixed together are 53.3 mL of 0.110 M hydrochloric acid, 102.0 mL of 0.249 M of nitric acid, 503.0 mL of 0.0107 M calcium hydroxide, and 200.0 mL of 0.129 M rubidium hydroxide. Did the acids and bases exactly neutralize each other?
If MS2 is 40.06% sulfur by mass, what is the identity of the metal M?
which one is more polar, capsaicin or dihydrocapsaicin?
If 243 mL of gas is collected at 25 C and has a total pressure of 745 mm Hg, what mass of hydrogen is produced? A possibly useful table of water vapor pressures is provided below. Mg(s) 2 HCl(aq) → MgCl2(aq) H2(g) T (°C) P (mm Hg) 20 17.55 25 23.78 30 31.86
A student placed 16 of glucose () in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100mL- mark on the neck of the flask was reached. The flask was then shaken until the solution was uniform. A 60.0- sample of this glucose solution was diluted to 0.500 . How many grams of glucose are in 100. of the final solution?
A 255 mL round-bottom flask is weighed and found to have a mass of 114.85 g. A few milliliters of an easily vaporized liquid are added to the flask and the flask is immersed in a boiling water bath. All of the liquid vaporizes at the boiling temperature of water, filling the flask with vapor. When all of the liquid has vaporized, the flask is removed from the bath, cooled, dried, and reweighed. The new mass of the flask and the condensed vapor is 115.23 g. Which of the following compounds could the liquid be? (Assume the ambient pressure is 1 atm.) A) C2H6 B) C3H7OH C) C4H9OH D) C2H5OH E) C4H10
Get college assignment help at uniessay writers A 1-L flask is filled with 1.30 g of argon at 25 degrees Celsius. A sample of ethane vapor is added to the same flask until the total pressure is 1.05 atm. What is the partial pressure of argon in the flask?
assume that H2O can be a base. Complete the balance equation NaOCH3(aq) H2O(l)–>NaOH
Lewis structures for CH2NO2‾
A chemist finds out that 3.0 g of sulfur added to 5.0 g of oxygen produces 8.0 g of sulfur trioxide. If a chemist combines 200.0 g of each element how much product will be produced and how much would be left over?
Which one of the following is a redox reaction? Answer A. 2Na(g) Cl2(g) → 2NaCl(s) B. Ba2 (aq) SO42-(aq) → BaSO4(s) C. Na2CO3(s) 2HCl(aq) → 2NaCl(aq) CO2(g) H2O(l) D. K2Cr2O7(aq) 2KOH(aq) → 2K2CrO4(aq) H2O(l) E. H2O(l) → H (aq) OH-(aq)
Calculate the density of propanol C3H8O if you know that there are 1.069×1025 molecules of propanol in 1.35 L. 1. 0.0131 g/mL 2. 0.789 g/mL 3. 1.27 g/mL 4. 13.1 g/mL 5. 0.234 g/mL 6. 1.23 g/mL
How many moles are in 63.0 g of (NH4)2Cr2O7? 1. 1.00 mol 2. 4.00 mol 3. 0.250 mol 4. 0.500 mol
Calculate the percentage composition of bar- ium nitrate (Ba(NO3)2). Choose the correct percentages for Ba, N, and O. 1. 52.55% Ba, 10.72% N, 36.73% O 2. 11.11% Ba, 22.22% N, 66.67% O 3. 10.72% Ba, 52.55% N, 36.73% O 4. 50.00% Ba, 10.00% N, 40.00% O 5. 56.54% Ba, 12.54% N, 30.92% O
500 mL of 2Mhydrochloric acid is mixed with 100 mL of 3 M calcium hydroxide. What is in this reaction vessel (in significant amounts) after the reaction has run to completion? 1. water, calcium chloride, Ca2 , and OH− 2. water, calcium chloride, HCl molecules, H3O , and Cl− 3. water, calcium chloride, and HCl molecules 4. water, calcium chloride, and Ca(OH)2 molecules 5. water, Ca2 , H3O , and Cl− 6. water, calcium chloride, Ca2 , OH−, H3O , and Cl− 7. water, calcium chloride, Ca(OH)2 molecules, Ca2 , and OH−
Select the correct Lewis structures for the following species, including all resonance forms for CH2NO2-
When (R)-2-bromobutane reacts with NaOCH3, the product will have what stereochemical configuration?
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