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how many grams of Na are needed to react with H2O to liberate 400mL of H2 gas at STP?
5 answers
asked by
justin
1,736 views
Find the volume of a starburst candy (220 cm cubed). The mass is 5.14 grams. Calculate it's density. How many starburst would it
5 answers
asked by
jj
3,669 views
The molar heat capacity of C6H6(ℓ) is 136 J/mol ·◦C and of C6H6(g) is 81.6 J/mol · ◦C.
The molar heat of fusion for
4 answers
asked by
bob
2,790 views
I have to convert the following pressures into torr:
1. 2.48x10^-3atm 2. 4.75x10^6atm 3. 7.60x10^6 i have no idea how to convert
4 answers
asked by
bb
1,955 views
300 mL of O2 are collected at a pressure of 645 mm of mercury (mm Hg). What volume will this have at one atmosphere pressure?
4 answers
asked by
dallas
645 views
determine the molarity of each of the ions present in the following aqueous salt solutions (assume 100% ionization)
1.25 M CuBr2
4 answers
asked by
Anonymous
3,138 views
what is the final pH after 1 drop(.05ml) of 6M HCl is added to 1.0L of freshly prepared pure water that was originally at a pH
4 answers
asked by
tiffany
1,846 views
When 16 g of ice at 0°C is dropped into 250 g of water at 42°C, what would be the final temperature?
3 answers
asked by
Anonymous
257 views
Many home barbecues are fueled with propane gas (C3H8). How much carbon dioxide in kilograms is produced upon the complete
4 answers
asked by
Carry
3,667 views
Calculate the density of oxygen,O2 , under each of the following conditions:
1- STP 2- 1.00 atm and 35.0 C
7 answers
asked by
unknown
9,543 views
what type of reaction occurs when potassium metal reacts with fluorine gas?
4 answers
asked by
Tiffine
4,097 views
How many moles of molecules are there in 250 grams of hydrogen nitrate?
4 answers
asked by
mary
3,918 views
what will be the mass of angydrous Alum left over if one starts with 100.00 g of hydrated Alum?
please can you explain what
4 answers
asked by
Jay
1,369 views
If 26.5 mL of 0.222 M HCl reacts with excess Mg, how many mL of hydrogen gas are produced at STP?
4 answers
asked by
Jenny
1,691 views
five ml of ethonal has a mass of 3.9g and 5.0ml of benzene has a mass of 4.4g which liquid is denser
density=mass/volume We have
1 answer
asked by
delonte
441 views
get a piece of ice, rub it on your arm until it melts. Do you feel the heat leaving your body to melt the ice?
how much heat was
1 answer
asked by
jennifer lowman
722 views
Consider the titration of 50 mL of 0.15 M NH3 with 0.1 M HCl. What is the pH at the equivalence point of the titration? (Kb=
4 answers
asked by
bert
1,244 views
Can someone please explain how to determine the molar mass of the following
nitric acid(HNO3) ammonium nitrate(NH4NO3) zinc
2 answers
asked by
john
509 views
in a soda-acid fire extinguisher, concentrateed sulfuric acid reacts with sodium hydrogen carbonate to produce carbon dioxide,
1 answer
asked by
leslie
787 views
To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 1.00-L bulb, then
4 answers
asked by
unknown
749 views
is this correct?:
word equation: nitric acid+potassium hydroxide= potassium nitrate balanced symbol equation:
5 answers
asked by
andréa
1,442 views
What would happen if you reacted potassium dicarbonate with HCL and NaOH?
5 answers
asked by
Lena
269 views
Use the mole ratio of CuO produced per mole of malachite to write a balanced equation for the malachite decomposition reaction.
1 answer
asked by
cheryl
474 views
2C2H2(g)+5O2(g)=4CO2(g)+2H2O(g) If 50.0 mols of carbon dioxide were produced, how many mols of acetylene (C2H2) were used?
1 answer
asked by
michela
1,023 views
how many grams are in 5.66 mole of of CaCo3
1 answer
asked by
qualesha
400 views
how many grams of KCL are there in 1200 ml of a 2% KCI solution
1 answer
asked by
shon
492 views
If 15 grams of copper (11) chloride react with 20 grams of sodium nitrate, how much sodium chloride can be formed? Hint: you
4 answers
asked by
jill
4,441 views
How much energy is needed to melt a 30.5 g ice cube?
1 answer
asked by
Christopher
422 views
(NH4)2SO4 How many atoms
4 answers
asked by
Patti
536 views
What is the percent bromine in a compound made of 1g of hydrogen and 80g bromine?
1 answer
asked by
nique
422 views
Sulfuric acid reacts with hydrogen iodide to produce sulfur dioxide, iodine and water.
a) write total ionic equation b)write net
1 answer
asked by
help!
1,210 views
what is the name of this substance K2Cro4
1 answer
asked by
ann
322 views
How many moles of carbon monoxide form at the same time that 0.337 mol CS2 forms?
4 answers
asked by
jake callienf
805 views
balance ___ch3ch2cooh + __o2 yields __co2 + ___h2o
3 answers
asked by
joey
368 views
What mass of iodine contains the same number of atoms at 25.0 g of chlorine?
4 answers
asked by
Anonymous
3,152 views
A bottle labeled 0.150Msulfuric acid contains a solution with what concentration in sulfate
ions?
1 answer
asked by
sarah
308 views
what is the molarity of ZnCl2 that forms when 30.0 g of zinc completely reacts with CuCl2 according to the following reaction?
2 answers
asked by
melissa
679 views
does NF3 follow the octet rule
4 answers
asked by
olivia
3,764 views
A nitric acid solution is neutralized using sodium hydroxide. How many grams of sodium hydroxide are needed to neutralize 5.50 L
2 answers
asked by
silent
569 views
when looking at a chemical equation what are the evidences that a chemical reaction has occured. Or what is the evidence that it
1 answer
asked by
hannah
330 views
600 mL of an unknown monoprotic acid was titrated with a standard solution of a 1.0 M base. If it took 40.0 mL of the base to
2 answers
asked by
ana
474 views
Posted by STACY on Monday, December 13, 2010 at 7:56pm.
Consider an aqueous solution prepared from 250.0 mL of water and 1.27 g
3 answers
asked by
STACY
810 views
A mixture contains only NaCl and Al2(SO4)3. A 1.76-g sample of the mixture is dissolved in water, and an excess of NaOH is
3 answers
asked by
hope
938 views
A mixture contains only NaCl and Al2(SO4)3. A 1.76-g sample of the mixture is dissolved in water, and an excess of NaOH is
3 answers
asked by
hope
556 views
115 grams of KCl is dissolved in 750 ml of water. what are the molality, molarity, mole percent, % mass, ppm by mass. what would
5 answers
asked by
shaknocka
926 views
I'm totally confused about this question....I don't know what kind of an answer the teacher is looking for. The worksheet has
2 answers
asked by
desiree
523 views
A 3.2 liter sample of gas is at 40.0oC and 1.0 atmosphere of pressure. If the temperature decreases to 20oC and the pressure
3 answers
asked by
sheshe
1,155 views
A 5.10-g sample of iron is heated from 36.0 C to 75.0 C. The amount of energy required is 89.5 J. the specific heat capacity of
2 answers
asked by
emily
546 views
how many grams of magnesium sulfate are required to make 575 ml of a 1.65% (m/v) solution
1 answer
asked by
jess
449 views
4. N2+3H2----2Nh3 k=1.2 at a T=375C
you initially have 0.249mol of N2. 3.21*10^-2mol of H2, and 6.42*10^-4 mol of NH3 in a 3.5L
2 answers
asked by
shanice
618 views
The pressure of a gas has increased from 300 kPa to 600 kPa. The volume of the container has not changed, and the number of
2 answers
asked by
Anonymous
552 views
calculate the molarity of a solution with .2 moles of sodim hydroxide dissolved in .5L of water
1 answer
asked by
Anonymous
322 views
Farmers often spray water on plants when there is a chance of frost to protect them from freezing. Calculate the amount of heat
4 answers
asked by
Vt
590 views
Farmers often spray water on plants when there is a chance of frost to protect them from freezing. Calculate the amount of heat
2 answers
asked by
Vt
521 views
2. (a) Given the following equations and H0rxn at 250C
H3BO3(aq) �¨ HBO2(aq) + H2O(l) ∆H0rxn = -0.02kJ H2B4 O7(s) + H2O(l)
2 answers
asked by
ceasar3
507 views
What volume of silver will weigh exactly 25.0g? The density of silver is 10.5g/ml.
1 answer
asked by
eliza Higgins
409 views
give the conjugate base for HNO2
2 answers
asked by
melanie
791 views
14KMnO4+4C3H5(OH)3----->7K2CO3+7Mn2O3+5CO3+16H2O how to do it help me if you can I spend days to find this but I couldn't please
1 answer
asked by
pamela
373 views
I have data for titration of a strong base against a strong acid when I added volumes of NaOH 1 mL at a time to 50.00 mL of HCl
2 answers
asked by
marla
863 views
how do you convert 50 microliters of 2 butanol to moles?
4 answers
asked by
jessica
423 views
What volume of HCl gas at 25â—¦ C and 1 atm should be bubbled into 375 mL of a 0.680 M aqueous solution of HClO4 so that the
3 answers
asked by
Clayton
611 views
0.100 M solution of a weak acid, HX, is known to be 15% ionized. The weak acid has a molar mass of 72 g/mol.
1. What is Ka for
1 answer
asked by
Clayton
803 views
when 2.75 mol HI(g) placed in 1L container and allowed to dissociate into
2HI(g) <==> H2(g)+I2(g) Final H2 concin .275M. What is
5 answers
asked by
chemistt
731 views
How many moles of Ba(OH)2 are present in 295mL of 0.800M Ba(OH)2?
1 answer
asked by
LL
359 views
Calcium carbonate can be decomposed by heating according to the equation Below. WHat is the percentage yield of calcium oxide in
4 answers
asked by
blah
1,225 views
At 450oC, the equilibrium constant Kc for the Haber-Bosch synthesis of ammonia is 0.16 for the reaction writeten as 3H2(g) + N2
2 answers
asked by
Helen
820 views
a 10.00ml diluted chloride sample required 44.89 ml of 0.01982 m abno3 to reach the fajans end point. how many moles of cl ion
2 answers
asked by
lisa
482 views
How many mL of a 0.5M Ca(OH)2 solution are needed to neutralize 38mL of a 2M HNO3 solution?
2 answers
asked by
Boo Boo
479 views
What is the approximate mass of 2L of C4H10 gas at STP?
1 answer
asked by
karen
369 views
What volume of 0.250 M calcium chloride needs to be added to sodium phosphate to produce 35.0g of calcium phosphate?
1 answer
asked by
kenny
397 views
12.00 liters of oxygen gas is under a pressure of 20 mm Hg. If the volume of this gas is decreased to 2.00 liters at constant
1 answer
asked by
Jo
407 views
NaOH + HCl -> NaCl + H2O
What is the molarity of a NaOH solution that required 31.6mL to neutralize 25.0mL of a 0.145 M HCl
3 answers
asked by
Jo
1,420 views
1.5 grams hydrogen
12 oxygen 2gram hydrogen 16 gram oxygen 2.5grams hydrogen 20grams oxygen
1 answer
asked by
dionna
331 views
1.5 grams hydrogen
12 oxygen 2gram hydrogen 16 gram oxygen 2.5grams hydrogen 20grams oxygen
1 answer
asked by
dionna
408 views
volume of water delivered using a buret has a mass of 2.67 g. What was the final volume reading on the buret if the inital
4 answers
asked by
mariam
428 views
What is the density of a 17.12 g object if the dimensions of the block are:
length = 12.6 mm height = 9.82 cm width = 0.0140 m
1 answer
asked by
mariam
354 views
Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to
BaO2(s)+H2SO4(aq)=BaSO4(s)+H
3 answers
asked by
Bob
825 views
3.14M NaN3 (pKb=9.28) is titrated with .663M HClO4 until it reaches the equivalence point. How do you calculate the pOH at the
3 answers
asked by
sreedevi
340 views
Calculate the volume of 4.0ml of nitogen gas at 754mmhg and 25 degrees celcius
1 answer
asked by
zane
280 views
what volume will be occupied by 3.25mol of oxygen gas at 735mmhg and 25celcius?
2 answers
asked by
raw
586 views
how many grams of sucrose must be dissolved in 1.5kg of water ot produce a solution which has a freezing point of -2.40 degrees
1 answer
asked by
Joan
397 views
calculate the heat energy released when 25.8 g of liquid mercury at 25 C is converted to solid mercury at its melting point.
Cons
2 answers
asked by
Jill
988 views
balancing equations H2+02=
1 answer
asked by
wasef
295 views
When magnesium metal and an aqueous solution of hydrochloric acid combine, they produce an aqueous solution of magnesium
2 answers
asked by
kim
604 views
In Duluth, Mn the average temperature is -13.10 deg C . How much ethonal glycol, C2H6O2, must be dissolved in 1.00 kg of water
1 answer
asked by
Ted
427 views
how many joules of energy are needed to change 275 g of water from 15 degrees C to steam at 100 degrees C?
2 answers
asked by
haley
997 views
calculate the H+ for green tea with a pH of 7.9
3 answers
asked by
ashley
603 views
Consider the following unbalanced equation between copper(I) ions and iron to produce copper metal and iron(II) ions: Cu+ + Fe
4 answers
asked by
Troy
1,680 views
how many mL of a stock 2.50M HCI solution are required to prepare 25.mL of a 0.15M HCI solution?
2 answers
asked by
latrese
464 views
I was told to post at the beginning of the page: not sure if I did so or how to really do it but i'm posting the question
3 answers
asked by
nns40760
514 views
convert 32.9g of neon into moles
3 answers
asked by
Iestyn
591 views
convert .98L of N20 gas at STP to moles
1 answer
asked by
Iestyn
357 views
The initial concentration of NO2 in a closed container is 0.750M. At equilibrium the concentration of O2 is 0.125M. What are the
2 answers
asked by
S
752 views
find the oxidation state of a carbon in methane, carbon monoxide, carbon dioxide, CH2O, acetic acid, carbonic acid, methanol,
2 answers
asked by
Allison
705 views
A cylinder with a moving piston expands from an initial volume of 0.350L against an external pressure of 2.70atm . The expansion
4 answers
asked by
samantha
2,421 views
how we prepare 0.5 mol of solution of hcl in 70ml in water
1 answer
asked by
asif
319 views
Gary is carrying out two chemistry experiments. In experiment A he mixes hydrochloric acid with sodium carbonate. In experiment
1 answer
asked by
lala
417 views
In aqueous reactions, if the amounts of reactants (and products) that are used are not given in moles, they are usually given
3 answers
asked by
Sammy
375 views
How many mL of .200 M NaOH are required to completely neutralize 5.00 mL of 0.100 M H2PO4?
2 answers
asked by
Jenny
865 views
Calculate the moles of Cu in 8.4×1021 atoms of Cu.
Express your answer using two significant figures.
2 answers
asked by
rolando
814 views
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