Q:calculate the maximum numbers of moles and grams of H2S that can form when 139 g of aluminum sulfide reacts with 116 g of water:Al2S3+ H2O -gt; Al (OH)3 + H2S (this is unbalanced)(a) mol H2S(b) g H2S(c) What mass of the excess reactant remains?_ g excess reactantPlease write your final answers with the correct amount of sig figs and please write out how you did it I need to know how to do this and I don't know which part I am messing up!

You MUST start with a balanced equationThen, because the masses of two reactants are given, you need to determine which of the two is the limiting reagent i.ewhich you have the least amount ofThen finally use the quantity of the limiting reagent to find the quantity of H?S that can be produced1.) Al?S? + 6 H?O → 2 Al(OH)? + 3 H?S (molar ratio of Al?S?:H?O is 1:6) 2.) determine limiting reagent: Al?S? 139-g Al?S? x ( 1 mol Al?S?/150.3-g Al?S?) 0.925 mol Al?S? H?O 116-g H?O x ( 1molH?O/18.0-g H?O) 6.44 mol H20 The balanced equation shows 1 mole of Al?S? requires 6 moles of H?O Since we have more than 6 moles of water but less than 1 mole of aluminum sulfide, aluminum sulfide limits the product30.9248 mol Al?S? x (3 mol H?S / 1 mol Al?S?) x 34.12-g H?S / 1 mol H?S a.) 0.9248 mol Al?S? x (3 mol H?S / 1 mol Al?S?) 2.77 mol H?S b.) 0.9248 mol Al?S? x (3 mol H?S / 1 mol Al?S?) x 34.12-g H?S / 1 mol H?S 94.7-g H?S c.) since the water we needed was 6 times the moles of Al?S?, we used 6 x 0.9248 5.549 moles of water 5.549 mol H?O x 18.0-g/mol 99.88-g usedThat leaves 116-g - 99.88 16.1-g remaining (sig digits allowed is 3 in each answer)

Q:Calculate the energy required in joules and calories to heat 29.2 g of aluminum from 27.2 degrees Celsius to 41.5 degrees CelsiusThe Specific Heat Capacity of aluminum is 0.89 joules/gram degree Celsius.Thank you!! :D

dH m C dT dH 29.2 g (0.89 J/g-C) (14.3 C rise in temp) dH 371.6 Joules your answer, rounded to 3 sig figs is 372 Joules

Q:How to make barbacoa?

Sizzling Brownie Recipe

Q:You determined that the molar ratio of aluminum to alum to be 1:1If you used 2.345 g aluminum, and the percent yield was 73%, determine the mass of alum produced.

Calculate 73% of 2.345 g0.73 x 2.345 g 1.71185 g This should be rounded to 1.712 g or 1.71 g.

Q:i dont have anything or any idea on what to use to stick them to so i can trasport them saftley to my new house, or do you know of something i can use to store them?

Use wax paper or freezer wrap- both available in the grocery store next to the aluminum foil, baggies, etcThe freezer wrap has a plastic-y, shiny side, stick it to thatWax paper's the same on both sidesGood luck! PS I used the fathead website to look up what a fathead IS - for the rest of the world who still doesn't know, they're like a giant, vinyl, NON-adhesive stickersThink Colorforms.

Q:Not sure if they are burner plates or linersFor the 4 burners on top of my stoveSquare shapedThey look like steel but they may be aluminum?? I HAVE NEVER USED THEM ONCEBut I guess cleaning the top of my stove over the years, liquid may have gotten under them, and now there is this rust like stuff that has built up on the bottom and top of them, as well as leaving a stain on the top of the stove surrounding the burnerCurious of any tips and tricks? I purchased some scouring pads, and put a bit of white vinegar, and some baking soda on it, and if I scrub really hard it will lessen, but its a lot of elbow grease neededAnything to help the process along? Again never used themIts not food burns, but I guess liquid that caused the stains over the years from cleaning that seeped under Now I will start using them and want to clean this gunky off themLOL

They are not aluminum if they are rusting It may be easier to buy replacements if the rusting and stains are significant I did a quick Google search and found several sets of the round bowls / pans for less than $15.00I can't imagine that the square ones that you have would be much more You should be able to find replacements in most large hardware storesI've even seen them in grocery stores.

Q:I have this really old silver coinIt's all tarnished and I dont know how to clean itCan u help me????

Homemade Easy Way to Clean Silver This procedure to clean silver at home lends itself to the removal of tarnish from flatware or hollowareIn an aluminum pot or a pot lined with aluminum foil, mix a dilute solution of equal parts of baking soda, salt, and liquid soapA quarter cup of each to a gallon of water would be a typical mixtureSet the sterling into the pot, bring the mix to a boil and allow to stand for a few minutesOxides are transferred to the aluminumRinse in water and wash before usingWe don't see any reason why this method wouldn't work for cleaning your tarnished silver findsYou might want to give it a try.

Q:Hi, guys.Please the equation for aluminium carbonate and phosphoric acid:Al2(CO3)3 + H3PO4 -gt; AlPO4 + H2O + CO2I just can't seem to balance it.

Since you have 2 Al on the left, you need 2 Al on the rightThat gives you 2 PO4 on the left, so you need 2 H3PO4 on the leftThen, you have 3 CO3 on the left, so you need 3 CO2 on the rightThat leaves you with 3 extra O and 6 extra H, which makes 3 H2OThe balanced equation is: Al2(CO3)3 + 2 H3PO4 - 2 AlPO4 + 3 H2O + 3 CO2

Q:What charge is associated with an aluminum ion? Explain?

Generally speaking an Aluminum ion has a positive charge, as it is an ion of metal with electro-positive characteristics (meaning a tendency to be reduced and give up electrons in the process)More specifically: the trivalent state (Al3+) is the most common (such as in aluminum oxide Al2O3), although other charge states can be produced under laboratory conditions: Al+ and Al2+.

Q:What's your family's favorite football snack? Recipe please.Wrong categorySue me.

One thing you could use to starch yarn rather than thread is to use a 1:1 glue water mixtureIt will dry and the glue will be crystal clear and it will be stiffenedI used this method to starch wings that I crocheted for a christmas tree angel and the effect was even better than the sugar methodIf it doesn't turn out stiff enough then make another solution with a little more glue and a little less waterBest of luck to you!!