Answers created by Jarni Renz

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• 1.91 g H2 is allowed to react with 9.86 g N2, producing 1.74 g NH3. What is the theoretical yield in grams for this reaction under the given conditions? Express your answer to three significant figures and include the appropriate units.
  
• Question #71843
  
• If 0,5kg of dextrose is dissolved in 600ml of water to produce a solution with a final volumeof 1000ml what is the percentage w/w strength of the solution?
  
• When the volume of a gas is changed from 250 mL to 425 mL, the temperature will change from 137° C. What is temperature 2? Using Charles law
  
• If 13.3 moles of Cu and 43.2 moles of HNO3 are allowed to react, how many moles of excess reactant will remain if the reaction goes to completion? 3 Cu + 8 HNO3 → 3Cu(NO3)2 + 2NO + 4H2O
  
• Question #1830f
  
• What is the average molar mass of a gas that is 67.0% H and 33.0% He?
  
• A compound X contains 50% sulpher and 50% oxygen by mass. what is the empirical ( simplest) formula of the compound X? Options a) SO b) SO2 c)SO3 d) SO4 please please Explain. :(
  
• Question #a5b7f
  
• Question #16cfd
  
• Question #55b04
  
• Question #54da7
  
• Question #82928
  
• #12%# of the student population in a school are left-handed. In a classroom of #25# students, how many are left-handed and how many are right-handed?
  
• Question #02f6e
  
• A man invests $17,000 in two accounts. One account earns 5% interest per. year and the other earns 6.5& interest per year. If his total interest after one year is $970.00, how much did he invest in each account?
  
• Question #89a6e
  
• Question #8453e
  
• Question #cef64
  
• Question #6bab1
  
• Question #c65e7
  
• How many atoms are in a #92.0*g# mass of ethyl alcohol?
  
• A silver block, initially at 58.5°C, is submerged into 100.0 of water at 24.8°C in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 26.2 °C. What is the mass of the silver block?
  
• A railway carriage of mass 10000kg moving with a speed 15/s hits a stationary carriage of same mass. after the collision the carriage get coupled and ove together. what is their common velocity after collision?
  
• The experimental calculation of the specific heat of aluminum was found to be 156 cal/g °C, but the actual value was given as 185 cal/g°C. What is the percent error?
  
• The annual interest rate of Erika's savings account is 6.4%, and simple interest is calculated quarterly. What is the periodic interest rate of Erika's account?
  
• Question #425b9
  
• Question #a1c07
  
• Question #e7d7a
  
• Here is the chemical reaction - Ca(NO3)2 + (NH4)3PO4 --> Double displacement follows... If you start with 10.25 mL of .553M Ca(NO3)2 soln, how many moles of calcium nitrate do you have in the soln? Also a part 2 in the question.
  
• Question #e7eb1
  
• 4FeS2 + 11 O2­ → 2 Fe2O3 + 8 SO2 Given 75.0 grams of FeS2, how many grams of sulfur dioxide are produced (MM in g/mol: FeS2=119.99, O2=32, Fe2O3=159.7, SO2=64.07) ? 40.0. g 70.0 g 150. g 80.0 g
  
• What is solute mass and mol solute of #NaHCO_3# which has the volume solution 250.0 mL and molarity 0.100 mol/L?
  
• An object with a mass of #120 g# is dropped into #800 mL# of water at #0^@C#. If the object cools by #30 ^@C# and the water warms by #5 ^@C#, what is the specific heat of the material that the object is made of?
  
• Question #42b7a
  
• How do you solve this system of equations: #2x _ { 1} - 10x _ { 2} + 7x _ { 3} = 7, 6x _ { 1} - x _ { 2} + 5x _ { 3} = - 2 and - 4x _ { 1} + 8x _ { 2} - 3x _ { 3} = - 22#?
  
• Question #3dbe1
  
• Question #f16a3
  
• How many grams of #CuSO_4# are present in 652 mL of .250 M #CuSO_4# solution?
  
• Marcus purchased 5 notebooks and 10 boxes of crayons for $31. Nina went to the same store and bought 10 notebooks and 5 boxes of crayons for $24.50. What is the cost of one notebook and one box of crayons?
  
• What was the heat lost from the system if #"5.25 g"# of water was cooled from #64.8^@ "C"# to #5.5^@ "C"#? #C_P = "4.184 J/g"^@ "C"#
  
• How do you use substitution to solve #3x - 2y = 2# and # x = 3y - 11#?
  
• Question #39aec
  
• A car's displacement is 42 km [S] after driving for .75 hours. What is the car's average velocity in km/h and m/s?
  
• What is a substance formed by the chemical combination of two or more elements in definite proportions?
  
• Heather invested $8,000 4-year savings bond that pays 4.1% interest compounded annually. What is the value of the savings bond at the end of the 4 years?
  
• Question #67561
  
• How many moles of #Sr(NO_3)_2# would be used in the preparation of 2.50 L of a 3.5 M solution?
  
• The densities of three aliquots of an unknown solution were found to be 1.028 g/mL, 1.043 g/mL, and 1.039 g/mL. Calculate the average density of this unknown solution?
  
• Use the tabulated density of water at 17 degrees celsius to calculate the theoretical mass of water (in grams) that should be delivered by a #"10.00 mL"# pipet? Density of water at #17^@ "C"# #=# #"0.998778 g/mL"#
  
• Question #8994e
  
• Question #28586
  
• What mass of dioxygen gas exists in a #51.7*L# volume of the gas under conditions of #"STP"#?
  
• Question #777f6
  
• Question #5321e
  
• Question #7716e
  
• Question #91c1d
  
• Question #115aa
  
• A wood fire burns at 260 °C. What is the temperature in Fahrenheit?
  
• Question #9b1f0
  
• Question #41282
  
• The ratio of the side lengths of an isosceles triangle is 7:7:3, and its perimeter is 190cm. What is the length of the base of the triangle?
  
• Question #12566
  
• Aluminum will react with sulfuric acid in the following reaction: #2Al(s) + 3H_2SO_4(l) -> Al_2(SO_4)_3(aq) + 3H_2(g)#. How many moles of #H_2SO_4# will react with 18 mol Al? How many moles of each product will be produced?
  
• Question #0085d
  
• Question #1bdae
  
• Question #6da34
  
• How many grams of phosgenite can be obtained from 13.0 g of #PbO# and 13.0 g #NaCl# in the presence of excess water and #CO_2#?
  
• An object with a mass of #18 g# is dropped into #400 mL# of water at #0^@C#. If the object cools by #150 ^@C# and the water warms by #12 ^@C#, what is the specific heat of the material that the object is made of?
  
• Question #c87b5
  
• How does barium chloride react with sulfuric acid?
  
• Air contains many substances, including nitrogen, carbon dioxide, and water vapor. What is air an example of?
  
• Question #d0f0e
  
• Question #a0976
  
• How do you calculate the amount of heat needed to increase the temperature of 250g of water from 20 C to 56 C? #C_g = 4.8 J/(C-g)#
  
• Question #049d4
  
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• Question #e5006
  
• 9. The density of water is 1.0 g/mL. What is the density of water in pounds/gallon?
  
• In a laboratory, 23.5 g of cyclohexane is burned and 5.5 liters of carbon dioxide was obtained ? a) Balance the reaction b) Calculate the reaction yield. d(CO2)= 1.9 g/L
  
• Question #f31fc
  
• How do you figure out how many electrons a sodium ion has? Can it be determined with a flame test?
  
• Mixture A was made by mixing different components together, but it appears to have one phase. What term best categorizes mixture A?
  
• How are 3 states of matter similar?
  
• Question #377d6
  
• What term best describes the type of reaction that happens when a molecule or compound reacts with another molecule or compound, producing two new molecules or compounds?
  
• What mass of #"potassium chlorate"# is necessary to generate a #5.5*g# mass of oxygen gas?
  
• Question #292bf
  
• The Sugar Sweet Company is going to transport its sugar to market. It will cost $5500 to rent trucks, and an additional $125 for each ton of sugar transported. What is the total cost to transport 16 tons of sugar?
  
• Ms. Pecho currently owes $637.50 in simple interest on a loan of $2500 at an annual interest rate of 17%. How long has she had the loan?
  
• Question #edba5
  
• Question #4658d
  
• What is the charge of a cation? How do cations form?
  
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