Questions asked by Mya M.

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• Sulfur combines with iron to form iron(II) sulfide. In an experiment, 15.24 g of Fe are allowed to react with 17.34 g of sulfur What is the limiting reactant? The reactant in excess? What mass of FeS is created?
  
• Sulfur reacts with oxygen to produce sulfur trioxide gas. If 3.15 g of sulfur reacts with 5 g of oxygen, what is the limiting reactant? How many grams of sulfur trioxide will be produced?
  
• In a double replacement reaction lead(II) nitrate reacts with sodium iodide. Given 5.0 grams of lead (II) nitrate and 3.0 grams of sodium iodide, how many grams of sodium nitrate can be formed?
  
• A student tries to mix copper (II) chloride with sodium nitrate. When that student combines 3 grams of copper (II) chloride with 4 grams of sodium nitrate, what mass of sodium chloride is dissolved in solution?
  
• How many moles are in 4.64 x 1025 atoms of H2CO3?
  
• How many grams are in 1.5 moles of MgCl2?
  
• 4 Fe(s) + 3O2(g) --> 2Fe2O3(g) In Certain reaction, 27.3 g of iron is reacted with 45.8 g of Oxygen. What is the limiting reactant?
  
• An unknown substance has the composition of 74.97% C, 7.4% H and 17.6% O. The compound has a molar mass of 272.3 g/mole. What is the molecular formula?
  
• N2 (g) + 3H2 (g) -->2 NH3 (g) The equation above is the equation for the Haber process. In a certain reaction, you start with 3.0 moles of nitrogen and 5.0 moles of hydrogen, which molecule is the limiting reagent?
  
• What is the molar mass of MgCl2? (in grams per mole)
  
• N 2 ( g ) + 3 H 2 ( g ) ⟶ 2 N H 3 ( g ) In a certain reaction, 5.0 moles of hydrogen is reacted with excess nitrogen. To determine how many moles of ammonia are produced, what conversion factor should be used?
  
• How many carbon atoms are present in 0.52 moles of C2H6O?
  
• Fe2O3(s)+3CO(g)⟶2Fe(s)+3CO2(g) How many moles of Fe2O3 are necessary to produce 1.648 mol of CO2?
  
• Calculate the mass of aluminum in 500 g of Al(C2H3O2)3 ?
  
• B2O3(s) + 3C(s) + 3Cl2 (g) ---> 2 BCl3(g) + 3CO(g) Calculate how many moles of BCl3 are produced from the reaction of 6122.0g of B203?
  
• 2NO(g) + O2 (g) --> 2NO2 How many moles of O2 are required to produce 92.0 g NO2?
  
• Oxygen gas is 21 % of Earth’s atmosphere. If the atmospheric pressure is 439mmHg, what is the partial pressure of oxygen at that location?
  
• What will be the effect on the pressure inside a rigid container of gas if the temperature of the gas is increased?
  
• A 5.00 L sample of helium at STP expands to 15.0 L. What is the new pressure on the gas?
  
• A 10.00 L sample of helium at STP expands to 20.0 L. What is the new pressure on the gas?
  
• 4.65 L of nitrogen at standard pressure is compressed into a 0.480 L container. What is the new pressure in mm Hg?
  
• To what temperature does 1.36 L of hydrogen originally at 25.0°C need to be heated in order to bring the volume to 2.5 L?
  
• 500.0 L of gas are prepared at 0.921 atm pressure and 200.0°C. The gas is placed into a tank under high pressure. When the tank cools to 20.0°C, the pressure is 30.0 atm. What is the volume of the gas under these conditions?
  
• The temperature of a gas is T1 and the original pressure is P1. The temperature of the gas is changed to T2. Which of the equations below would you use to find the new pressure (P2)?
  
• A gas sample in a rigid container at 455 K is brought to STP (273K and 1 atm). What was the original pressure of the gas in mmHg?
  
• What is the volume of gas at 2.00 atm and 200.0 K if its original volume was 300. L at STP?
  
• A noble gas is placed in a 10.0 liter container. The noble gas has a mass of 25.25 g, the pressure is 3.05 atm, and the temperature is 24°C. Find the molar mass and symbol for the gas. ?
  
• What is the solvent in a liquid-liquid solution?
  
• What is the freezing point depression when sugar is dissolved in water to make a 0.50 molal solution?
  
• 5.35 grams of sodium chloride are dissolved to make 150 milliliters of solution. What is the molarity of the solution?
  
• What is the molality when 0.15 mol SO2 is dissolved in 100 ml water? Remember 1 ml of water = 1 gram of water)
  
• How many grams of silver chromate are produced when 250. mL of 1.500 M Na2CrO4 are added to excess silver nitrate? Please balance the equation before solving the problem.
  
• Which solution will have a higher boiling point: A solution containing 15 grams of sucrose (C12H22O11) in 25 grams of water or a solution containing 35 grams of sodium chloride in 500 grams of water?
  
• How many moles are present in a 4.25 m aqueous solution prepared with 400. g of water?
  
• How many moles of Ca(NO3)2 are there in 500 mL of 0.25 M solution?.
  
• 0.550 moles of NaCl are dissolved in 1.95 L of water. Calculate the molarity of the NaCl solution. ?
  
• Identify an equation in standard form for a hyperbola with center (0, 0), vertex (0, 7), and focus (0, 11). ?
  
• In a computer game, when choosing a character there are 5 choices for hair style, 3 choices for eye color, and 7 choices for outfits. How many different characters are possible if you were to choose 1 hair style, 1 eye color, and 1 outfit?
  
• What exactly is this principle of the "invisible hand" in relationship to the free market?
  
• In a high school band there are 11 students in the drumline section. The drumline for a football game consists of 6 students. In how many ways can the drumline be formed for a football game?
  
• There are 12 cars contesting a race. The first three cars completing the race will be awarded prizes. In how many ways can the prizes be awarded?
  
• Barbara has 7 swimsuits. She needs to take 4 swimsuits on a vacation. In how many different ways can she choose 4 swimsuits out of 7?
  
• What is the molarity of HCl found in a titration where 150 ml of HCl is titrated with 10 ml of 1 M NaOH?
  
• There are 40 pieces of building blocks in a bag: 10 each of blue, green, red, and yellow. Two pieces are chosen at random. Identify the probability that both of the pieces chosen are green. ?
  
• In the reaction below and state what is being oxidized and what is being reduced.? N2 + H2 → NH3
  
• In the reaction below state what is being oxidized and what is being reduced.? 4 Fe + 3 O2 → 2 Fe2O3
  
• What is the molarity of HCl found in a titration where 30 ml of HCl is titrated with 15 ml of .1M NaOH?
  
• Calculate the [OH−] in a solution with a pH of 12.52. ?
  
• A card is drawn from a deck of 52. What is the probability of drawing either a diamond or a seven?
  
• Of 800 people surveyed, 420 were male, and 325 had cell phones. Of those with cell phones, 200 were female. What is the probability that a person surveyed was either male or had a cell phone?
  
• Use the de Broglie's Wave Equation to find the wavelength of a 200 g ball moving at 20 m/s. Please show your work. Note: h = Plank's constant (6.62607 x 10-34 J s) ?
  
• Use the de Broglie's Wave Equation to find the wavelength of an electron moving at 3 × 106 m/s. Please show your work. Note: h = Plank's constant (6.62607 x 10-34 J s) ?
  
• Identify the indicated sum for the geometric series. S9 for 3 − 6 + 12 − 24 + ..... ?
  
• Use the de Broglie's Wave Equation to find the wavelength of a 2.22 g ball moving at 2 m/s. Please show your work. Note: h = Plank's constant (6.62607 x 10-34 J s) ?
  
• Write the beta decay equation for the following isotope: 77/33 As ?
  
• If a wavelength is 3.02 x 10^2 meters, what is the frequency? Please show your work along with the final answer.