Answers edited by Manish Bhardwaj

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• How do you simplify the expression #3x-x+4#?
  
• Question #e484d
  
• How can I calculate the moles of a solute?
  
• If you have 21 moles of gas held at a pressure of 78 ATM and a temperature of 900 k, what is the volume of the gas?
  
• Question #25589
  
• Question #52b92
  
• Question #f4231
  
• What is the concentration of lead ions and sulfide ions in a saturated solution of lead sulfide (#PbS#) solution at 25°C?
  
• A 40.0 L tank of ammonia has a pressure of 8.00 atm. Calculate the volume of the ammonia if its pressure is changed to 12.0 atm while its temperature remains constant.
  
• Question #b7af7
  
• How can we identify dependent variables?
  
• How many grams of Na2O are required to produce 1.60 x 102 grams of NaOH? Na2O + H2O ---> 2 NaOH
  
• How can I write the formula for strontium fluoride?
  
• If the reaction of 20.7 grams of CaCO3 produces 6.81 grams of CaO, what is the percent yield? CaCO3=>CaO+CO2
  
• What is the equation for finding the equilibrium constant for a chemical reaction?
  
• Question #e293b
  
• Why are endothermic reactions useful?
  
• What is the mass of 5.99 mole of carbon monoxide?
  
• What is the percent composition of a compound with the empirical formula #MgCl_2#?
  
• How would you calculate the molar mass of water?
  
• What is stoichiometry?
  
• How can I write the formula for calcium nitride?
  
• How many moles are in 45.0 sample of #MgO#?
  
• What is the total number of oxygen atoms on the left-hand side of #2Ca_2(PO_4)_2(s) + 4SiO_2(s) + 12C(s) -> 4CaSiO_3(s) + P_4(s) + 12CO(g)#?
  
• What mass of carbon dioxide is produced from the complete combustion of #8.50*10^-3# #g# of methane?
  
• How does mass number relate to the particles in the atom?
  
• Question #23843
  
• Can someone explain how to do this? Consider the following equation: 2ZnS(s) + 3O2(g) ---> 2ZnO(s) + 2SO2(g), ΔH° = –878.2 kJ. What is the enthalpy change when 223.9 g ZnS(s) reacts in excess oxygen?
  
• How do you determine how far Doris can travel is Doris’s truck gets #10 \frac{2}{3}# miles per gallon and her tank has #5 \frac{1}{2}# gallons of gas?
  
• What is the product of #3/5xx5/12#?
  
• How do you determine the length of each of the ribbons if Nadia takes a ribbon that is 48 inches long and cuts it in two pieces where one piece is three times as long as the other?
  
• What are some examples of compounds?
  
• Question #df3c0
  
• What are some examples of ionic formulas?
  
• What is x if #4x+3/x-9=5#?
  
• How do you simplify #(x + 4) - 2(x + 5)#?
  
• What is the correct formula of an ionic compound containing Fe-2 and PO4-3 and how is it called?
  
• How does solubility change with temperature for gases?
  
• Oxygen gas is at a temperature of 40°C when it occupies a volume of 2.3 liters. To what temperature should it be raised to occupy a volume of 6.5 liters?
  
• Question #162a7
  
• How can enthalpy change be determined for an aqueous solution?
  
• How does heat affect the phases of matter?
  
• What is a neutral atom?
  
• Can you find the number of moles of Argon in 607 grams of Argon?
  
• How do you solve for a if #F=7 1/3# and #m=1/5# given Newton's second law states the #a=F/m# where a is the acceleration, F is the form, and m is the mass?
  
• According to Avogadro's law, as the number of moles of gas increases, what happens to its volume?
  
• Question #1847d
  
• How do you solve for t in #2/7(t+2/3)=1/5(t-2/3)#?
  
• How do you evaluate the expression #((3x+x)/y)# when #x=4# and #y=2#?
  
• How many grams of solid calcium hydroxide, Ca(OH)2, are required to react with 350 mL of 0.40 M HCl? __HCl + __Ca(OH)2
  __CaCl2 + __H2O
  
• How do you simplify #6 + (x - 5) + 7#?
  
• How many moles are present in 1.21 X 10^24 molecules of HBr?
  
• How do you find the quotient of #(4x^2 – y^2) ÷ (2x – y)#?
  
• How do you calculate mole fraction of solute?
  
• What is the formula for Magnesium Triiodine? I think it is Mg(I3)2 but wanting to confirm.
  
• A gas occupies 11.2 liters at 0.860 atm. What is the pressure if the volume becomes 15.0 L?
  
• If the half life of an unstable element is 5000 years, what percentage of the parent material will be left after 10000 Years?
  
• A sample of O2 under 2.00 atm occupies 500 ml at 25.0˚C. What pressure will the sample have at 0.0˚C ?
  
• How do you calculate entropy change?
  
• How do you calculate mole fractions?
  
• How do you multiply #2/7 \cdot -3.5#?
  
• Question #ada60
  
• Question #5bc49
  
• How can the formation of a solution be exothermic or endothermic?
  
• How do you mulitply #2 1/3 xx 5 2/4#?
  
• Why the total mass of reactants and of product not change in a chemical reaction?