Questions asked by Mint

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• Find the formula weight of #"Ca"("C"_6"H"_12"NO"_3"S")_2#?
  
• Convert A) 10 atoms of C to mol C B) 5.1x10^22 atoms Cu to grams?
  
• A sample of a pure substance with a mass of 0.963g contains 4.84x1-^-3 moles. What is the formula weight of the substance comprising the sample?
  
• How do you convert the following? A)0.56 mol C6H6 to molecules C6H6 B) 4.25x10^-4 mol to H2SO4 to grams
  
• How many molecules or formula units are present in the following? A)1 mole of H2O B) 2.67 moles of CO2
  
• A 1.85 mole sample of the ionic compound Al2(SO4)3 contains how many moles of the following? A) Al atoms B) S atoms C) Al3^+
  
• Balance the equation: C + Fe2O3 → Fe + CO ?
  
• Balance the following equations?
  
• Change into formula equations and balance them? (easy steps to balance)
  
• Complete and balance the equation?
  
• Complete and balance the equation?
  
• How many moles of H2O could be obtained by reacting 0.75 mole of H2O2 in the reaction H2O2+H2S→2H2O+S?
  
• A mixture of hydrazine and hydrogen peroxide is used as a fuel for rocket engines. How many grams of hydrazine are needed to react with #0.453# moles of hydrogen peroxide?
  
• How to find the limiting reactant given moles?
  
• #2"Al"+3"S"→"Al"_2"S"_3# 125g of Al2S3 was produced from 75g of Al & an excess of S What is the theoretical yield of Al2S3?
  
• Carbon disulfide, CS2 can be made from coke, C and sulfur dioxide, SO2: 3C + 2 SO2→ CS2 + CO2. If the actual yield of CS2 is 86% of the theoretical yield, what mass of coke is needed to produce 950g of CS2?
  
• In the following equations, determine which reactant is the limiting reactant and which reactant is in excess.? The amounts mixed together are shown below each reactant. a) 2NaOH(10g) + H2SO4(10g) →Na2SO4+2H2O
  
• Indicate whether each of the ff. reactions is exothermic or endothermic? a) Br2(l)+Cl2(g)→2 BrCl(g) Δ H=29.4kJ
  
• A 30% solution of ethyl alcohol in water at 20° C has a density of 0.95g/mL. What weight of alcohol is combined in 750 mL of solution?
  
• Determine the molarity and nomality of the aqueous solution containing 100g of Al2(SO4)2?
  
• What weight of solute is needed to prepare 350mL of 0.6M Na2CO2?
  
• A 35 mL sample of concentrated H3PO4 (14.7M) is diluted to a final volume of 250 mL. a) what is the M of the final solution? b) How much solvent is added to the original solution?
  
• The density of an aqueous solution containing 10% of ethanol, C2H5OH, by mass is 0.984 g/mL. Calculate the a) M b) m of this equation c) What volume of the solution would contain 0.125 mole of ethanol? d) Calculate the mole fraction of water inthesolution
  
• Find the ΔH° for the reaction? a) Fe2O3(s)+3CO2(g)→2Fe(s)+3CO2(g)
  
• Magnesium nitride may be prepared by the direct reaction of the elements as shown 3 mg(s)+n2(g)=Mg3N2(s). For each combination of the ff. combinations of reactants decide which is limiting reactant?
  
• The temperature of 3.0L of a gas is changed from 27° C to -10° C at constant pressure. What is the new volume in mL?
  
• A solution that contains #"13.2 g"# of solute in #"250 g"# of #"CCl"_4# freezes at #-33^@ "C"#. What is the FW of the solute? #T_f^"*"# of #"CCl"_4# is #-22.8^@ "C"# and its #K_f = -29.8^@ "C/m"#.
  
• A gas thermometer contains 250 mL of gas at 0° C and 1.0 atm pressure. If the pressure remains at 1.0 atm, how many mL will the volume increase for every one celsius degree that the temperature rises?
  
• Two integers have a sum of 16. one of the integers is 4 more than the other. what are the other two integers?
  
• The entrance fees to a theme park are $10.00 for adults and $6.00 for children. On a slow day there are 20 people who pay entrance fees for a total of $164.00 solve the simultaneous equations to work at the number of adults and numbers of children?
  
• Convert 10 metric tons to grams? 3 days to sec 100km to mm 20 miles to m 200lbs to kg
  
• Find the resultant vector? 1/6 of 240 m/s directed east ?= 1/4 of 240 m/s 1/5 of 250 degrees south of west
  
• A body moving with constant acceleration covers between two points 60m apart in 6 sec. It's velocity as it passes the second point is 15m/s. A) What is its acceleration? B) What is its velocity at the first point?
  
• Prove that EF // GH?
  
• Does 5+(11+8)=5+8+11. Illustrate the commutative the commutative or associative property? explain your answer
  
• A car is moving in the east direction with the velocity of 30.0 miles/hour. To avoid head on collision the breaks are applied and the car is brought to rest in 10.0s. Calculate the average acceleration of the car?
  
• An object with an initial speed of 50.0 ft/s is accelerating at 2.00ft/s^2. Find (a) the speed after the body has covered a distance of 500ft and (b) the time taken to cover this distance?
  
• Antonio canvassed the price of a T-shirt for a store offering $500 each at 15% discount and $520 at 20%. Which is the better offer and by how much?
  
• In a survey for a certain issue of 6,400 people, 35% agree, 60% disagree and the rest have no opinion. How many people agree, disagree and have no opinion?