Answers edited by Kayla

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• How do you solve # 12 + 3x = 30#?
  
• A mixture of two gases has a total pressure of 6.7 atm. If one gas has a partial pressure of 4.1 atm, what is the partial pressure of the other gas?
  
• How many moles is 135 L of ammonia gas at STP?
  
• What is the molar mass of copper(l) nitrate, #Cu(NO_3)_2#?
  
• How do you balance #PbSO_4 → PbSO_3 + O_2#?
  
• The mass number of a chromium atom is 52 and it has 24 protons. How many neutrons does this atom have?
  
• Solid magnesium has a specific heat of 1.01 J/g°C. How much heat is given off by a 20.0 gram sample of magnesium when it cools from 70.0°C to 50.0°C?
  
• How many moles of #ZnCl# are in 100 mL of 0.300 M solution?
  
• What is the molality of a solution in which 2.3 g #O_2# gas dissolved in 355 g of water?
  
• What is 480 cm as m?
  
• How do you solve #4=(5z+2)/3#?
  
• What is the boiling point (in °C) of a 1.56 m aqueous solution of #CaCl_2#?
  
• If #9 L# of a gas at room temperature exerts a pressure of #12 kPa# on its container, what pressure will the gas exert if the container's volume changes to #4 L#?
  
• An #HCl# solution has a concentration of #3.26 * 10^-2# #M#. What is the pH of this solution?
  
• What is STP in chemistry?
  
• If #2.4*10^5# #L# of gas is at #180# #mmHg#, what is the pressure when the gas is compressed to #1.8*10^3# #L# at constant temperature?
  
• How do you solve #x − 6 = 11#?
  
• What is the #[OH^-]# in a solution that has a #[H_3O]=1.0*10^-6# #M#?
  
• What is the volume of 19.87 mol of ammonium chloride (#NH_4Cl#) at STP?
  
• How many #"g"# of water are required to be mixed with #"11.75 g"# of #HgCl# in order to make a #"0.01 m"# solution?
  
• How do you solve #3.4/x=2.17/7.7#?
  
• If an atom contains 12 protons and 10 neutrons, what's its mass number?
  
• A container with a volume of #7 L# contains a gas with a temperature of #420^o K#. If the temperature of the gas changes to #300 ^o K# without any change in pressure, what must the container's new volume be?
  
• What is the density of sulfuric acid if 35.4 mL of the acid weighs 65.14 g?
  
• How do you find the length of the missing side given a=19 b=? c=26?
  
• How do you use the Henderson-Hasselbalch to calculate the pH of a buffer solution that is .50 M in #NH_3# and . 20 M in #NH_4Cl#?
  
• How do you solve #10x^2-11x-6=0#?
  
• A solution has #[H^+] = 2.0 * 10^-5# #M#. How do you find the pOH of this solution?
  
• 62% of what is 89.3?
  
• How is a Celsius temperature reading converted to a Kelvin temperature?
  
• If #3 L# of a gas at room temperature exerts a pressure of #15 kPa# on its container, what pressure will the gas exert if the container's volume changes to #5 L#?
  
• How do you solve #6x^2 - 7x + 2 = 0# using the quadratic formula?
  
• How do you solve #4y+13=37#?
  
• A block of aluminum occupies a volume of 15.0 mL and weighs 40.5 g. What is it density?
  
• A textbook weighs 58.8 N on Earth. What is the mass of the textbook?
  
• With a 0.5 M solution, many moles of NaCI would there be in 1,000 mL?
  
• How do you figure out how many Valence electrons is in an atom?
  
• What is the total number of grams of #NaI# needed to make 1.0 liter of a 0.010 M solution?
  
• What is the reciprocal of #3#?
  
• How do you solve #n^2-4=77#?
  
• How do you solve #2x^2 - 5x - 3 = 0# using the quadratic formula?
  
• What is the amount of heat liberated (in kJ) from 327 g of mercury when it cools from 77.8°C to 12.0°C?
  
• How many molecules of water are there in 36 grams of #H_2O#?
  
• What is the difference of #9.4-7.9#?
  
• What is the molar mass of sodium oxygen oxalate #Na_2C_2O_4#?
  
• How many silver atoms are there in 4.01 g of silver?
  
• The density of mercury metal is 13.6 g/mL. What is the mass of 3.55 mL of the metal?
  
• How do you solve the inequality #2x - 8< 7#?
  
• What is the molar mass of #NH_3#?
  
• How do you solve for y: in # 3y = ab#?
  
• How many atoms are present in 48.60 g of Mg?
  
• How do you convert 16.2 ft to m?
  
• How do you determine the molar mass of #Fe_2O_3#?
  
• What is the power of a kitchen blender can perform 3750 joules of work in 15 seconds?
  
• How many grams of sodium hydroxide are needed to completely neutralize 25.0 grams of sulfuric acid?
  
• What is the pressure (atm) of 3.5 moles of helium at -50 °C in a rigid container whose volume is 25.0 L?
  
• How many moles of sodium nitrate, #NaNO_3#, would be produced from the complete reaction of 253g sodium chromate, #Na_2CrO_4#?
  
• If #12 L# of a gas at room temperature exerts a pressure of #64 kPa# on its container, what pressure will the gas exert if the container's volume changes to #24 L#?
  
• A certain shade of blue has a frequency of #7.32 * 10^14# #Hz#. What is the energy of exactly one photon of this light?
  
• What volume (in liters) does 2.895 moles of oxygen occupy at STP?
  
• If #7/5 L# of a gas at room temperature exerts a pressure of #6 kPa# on its container, what pressure will the gas exert if the container's volume changes to #2/3 L#?
  
• You have 1.25 L of oxygen gas at STP. What is its mass?
  
• Abdul runs 7 miles in 80 minutes. At the same rate, how many miles would he run in 64 minutes?
  
• How do you solve for x: # 3(2-x)=-12#?
  
• How do you solve #14-x=3x-2#?
  
• How do you solve #3x^2 - 8x + 5 = 0 # using the quadratic formula?
  
• What is the H+ concentration (in molarity) of a solution with a pOH of 6.7?
  
• How do you convert #5.3 * 10^25# molecules of #CO_2# to moles?
  
• A foam material has a density of #175# #g##/L#. What is its density in units of #lb##/ft^3#?
  
• A solution contains 225 g of glucose, #C_6H_12O_6#, dissolved in enough water to make 0.825 L of solution. What is the molarity of the solution?
  
• How do you solve #m - 1 1/2 = - 5/4#?
  
• How do you convert 100 mm Hg to Pa?
  
• Sam ran 63,756 feet in 70 minutes. What is Sam's rate in miles per hour?
  
• The pH of a solution is 8.7, what is the pOH?
  
• What volume is needed to store 0.80 moles of helium gas at 204.6 kPa and 300 K?
  
• A pendulum swings back and forth with a period of 0.5 s. What is the length of the pendulum arm?
  
• What is the mass, in grams, of 15 L of #O_2# at STP?
  
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