Ashlee

a chemical technician is planning to react 3.50g of lead(ii) nitrate with excess potassium bromide in solution (calculate a reasonable amount of KBr to be used)

for the mass of potassium bromide, i got 2.52g (please correct me if i'm wrong)

but now i need to calculate the mass of the precipitate and i don't know how

identify the limiting and excess reagents, and find the mass of excess reagent that will remain unreacted

12mg of barium nitrate in solution and 44 mg of potassium sulfate in solution

i have no idea how to go about doing this question, so could you please help me out by giving me step by step details

thanks :)

for each of the following combinations of reagents, identify the limiting and excess reagents, and find the chemical amount (moles) of excess reagent that will remain unreacted.

a) 10.o mol of methane and 10.0 mol of oxygen

b) 0.44 mol of copper(II) nitrate in solution and o.55 mol of sodium phosphate in solution

2. identify the limiting and excess reagents, and find the mass of excess reagent that will remain unreacted

a) 4.00g of aluminium and 4.50g of chlorine

b) 12mg of barium nitrate in solution and 44 mg of potassium sulfate in solution

i have no idea how to go about doing these questions, so could you please help me out by giving me step by step details

thanks :)

for each of the following combinations of reagents, identify the limiting and excess reagents, and find the chemical amount (moles) of excess reagent that will remain unreacted.

a) 10.o mol of methane and 10.0 mol of oxygen

b) 0.44 mol of copper(II) nitrate in solution and o.55 mol of sodium phosphate in solution

2. identify the limiting and excess reagents, and find the mass of excess reagent that will remain unreacted

a) 4.00g of aluminium and 4.50g of chlorine

b) 12mg of barium nitrate in solution and 44 mg of potassium sulfate in solution

i have no idea how to go about doing these questions, so could you please help me out by giving me step by step details

thanks :)

a student wants to take the sulfate ions out of solution but leave the hydroxide ions in solution. she needs a compound that will form a precipitate with Na2SO3 but which will not form a precipitate with KOH. name a compound that will selectively precipitate SO3^2-

could you tell me how to do this?

i think it would be a good idea to save up all the money we'll need to buy all the things we'll be needing for a new baby. how much do you think we should save up?

1. high conductivity, colorless solution, red flame color, addition of Na2SO4(aq) a white solid forms, with addition of AgNO3(aq) a white solid forms

2. high conductivity, colorless solution, yellow-green flame, with addtion of Na2SO4(aq) a white solid forms, with addition of AgNO3(aq) a white solid forms

3. no conductivity, colorless solution, no flame color, with addition of Na2SO4(aq) no precipitate forms, with addition of AgNO3(aq) no precipitate forms

4. high conductivity, colorless solution, red flame color, with addition of Na2SO4(aq) no precipitate forms, with addition of AgNO3(aq) a white solid forms

which one is ethanol, barium hydroxide, strontium chloride, lithium carbonate

calculate the mass of lead(II) chloride precipitate produced when 2.57g of sodium chloride in solution reacts in a double replacement reaction with excess aqueous lead(II) nitrate.

how do i do this question? what are the steps? could you help me out in detail please?

powdered zinc metal reacts violently with sulfur when heated to produce zinc sulfide. predict the mass of sulfur required to react with 25g of zinc.

I have no idea how to go about doing this question, so if anyone could help me by giving me a detailed answer, i would appreciate it so much! thanks.

predict the mass of precipitate that will be produced by the reaction of 20.0 mL of 0.210 mol/L sodium sulfide solution with an excess quantity of aluminum nitrate solution.

3 Na2S + 2 Al(NO3)3 = Al2S3 + 6 NaNO3

could you help me go through the steps of getting the answer, please?

if you could please help me with this question by doing all the steps in detail!

the balanced equation is 3HCl + Al(OH)3 = AlCl3 + 3H2O

i have an exam within the next 2 days and i can barely remember it

for example, a z score of 0.5 is 0.6915 on the chart (69.15%) and i want to know if there's any way of getting that percentage without using the chart

A is a second quadrant angle. If tan A = -√3/5, find cos A, csc A, and cot A.

is x negative and y positive because it is a second quadrant angle? if so, would r be √28? I can understand this stuff but I'm having trouble simplifying/rationalizing.

If you could help walk me through this example I would appreciate it very much! Thank you in advance!