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464 Answered Questions for the topic AP chemistry

Ap Chemistry Chemistry

09/18/20

Alexander Fleming discovered penicillin:

C16H18N2O4S, in 1928 at the University of London. He isolated the compounds from a mold which had contaminated some of his experiments. Since then penicillin has been used as a general antibiotic... more
Ap Chemistry Chemistry

09/18/20

Over the years, the thermite reaction has been used for welding railroad rails, in incendiary bombs, and to ignite solid fuel rocket motors.

The reaction isFe2O3(s) + 2Al(s) → 2Fe(l) + Al2O3(s)What mass of iron(III) oxide must be used to produce 76.73 g of iron? (Answer in grams)What mass of aluminum must be used to produce 76.72 g of... more
Ap Chemistry Chemistry

09/18/20

Consider the following unbalanced chemical equation.

C5H12(l) + O2(g) → CO2(g) + H2O(l)If 40.0 grams of pentane (C5H12) are burned in excess oxygen, how many grams of H2O will be produced? ______ g H2OAlso,LiOH(s) + CO2(g) → Li2CO3(s) + H2O(l)If 87.7... more
Ap Chemistry Chemistry

09/18/20

A compound with molar mass 110.1 g/mol has the following composition:

C 65.5%H 5.45%O 29.1%How would I do the math to determine the empirical formula?
Ap Chemistry Chemistry

09/18/20

Rank the elements in the table below in order from least to greatest number of atoms.

Element: Mass:He 12.9Be 15.9Mg 36.4Ca 87.2The atoms that I calculated:1.94x10^24 He1.06x10^24 Be9.03x10^23 Mg1.31x10^24 CaBut I am unsure on how to rank them least to greatest.
Ap Chemistry Chemistry

09/18/20

A chemist needs 1.00 L of an aqueous 0.200 M K2Cr2O7 solution. What mass of solid must be weighed out to make this solution?

Please show for better understanding :)
Ap Chemistry Chemistry

09/18/20

Typical blood serum is about 0.14 M NaCl. What volume of blood contains 1.0 mg NaCl?

Please show work for better understanding :)
Ap Chemistry Chemistry

09/18/20

Calculate the number of moles of Cl- ions in 1.75 L of 1.00 x 10-3 M ZnCl2 solution

Please show for for better understanding :).
Ap Chemistry Chemistry

09/18/20

Calculate the concentration of a solution made by dissolving 45.6 grams of Fe2(SO4)3 to 475 mL What is the concentration of each ion?

please show work for better understand :)
Ap Chemistry Chemistry Chem

09/18/20

What volume is required to prepare a 2.70 M HCl solution with 50.0 grams of HCl? What is the concentration of each ion?

Please show work as well for a better understanding. :)
Ap Chemistry Chemistry

09/18/20

Ammonia gas can be produced by the reaction of nitrogen and hydrogen gases as shown in the following balanced equation:

N2(g)+3H2(g) -----> 2NH3(g)Determine the mass of ammonia that can be produced from 10.8 g of N2(g) with excess H2(g)
Ap Chemistry

09/13/20

If 50.0 mL of 1.00 M lead(II) nitrate solution reacts with 75.0 mL of 0.500 M potassium iodide solution, determine which reactant is in excess the mass of lead(II) iodide that forms.

Potassium iodide and lead(II) nitrate solutions react together to form a precipitate of lead(II) iodide: 2KI(aq) + Pb(NO3)2(aq) → PbI2(s) + 2KNO3(aq)d) If 50.0 mL of 1.00 M lead(II) nitrate... more
Ap Chemistry Chemistry Chem

09/07/20

what mass of ammonia can be synthesized from 150g of h2?

Can you please show steps as well? thank you!
Ap Chemistry Chemistry Chem

09/07/20

Iron (II) sulfide contains 36.47% sulfur by mass. If 87.91 g of iron sulfide is made by reacting iron with sulfur, what mass of iron was reacted?

I really need help with this question. Can you please show steps as well? thank you!

05/20/20

can some one please explain

How many grams of iron (Fe, molar mass = 55.85 g∙mol–1) is needed to experimentally produce 50.0 g of iron(III) oxide (Fe2O3, molar mass = 159.70 g∙mol–1) if the percent yield is 78.7%?   
Ap Chemistry Chemistry Biochemistry

05/19/20

What is the concentration of bromide ion if 25.0 ml of a 0.50 M AlBr3 solution combines with 40.0 ml of a 0.35 M NaBr solution?

I converted AlBr3 and NaBr to moles however, I'm not so sure what to do after that. I know the final answer for the concentration of bromide ion is 0.79 mol/L. Can someone please help ?AlBr3 =... more
Ap Chemistry Chemistry Biochemistry

05/19/20

Can someone please tell me if there is an easier way to answer this question? and if I did it correctly please.

A 2.32g sample of Na2SO4*nH2 yields 1.42g Na2SO4 upon heating. What is the value of n?Na2SO4*nH20--->Na2SO4(s)+nH20(g)Molar Mass Na2SO4 =142 g/molMolar Mass H2O = 18.016 g/molI'm not sure if I... more
Ap Chemistry Science Chemistry

05/19/20

Tetrahydrocannabinol (thc), the active agent in marijuana, is composed of 80.16% carbon, 9.63% hydrogen and 10.17% oxygen by mass. What is the empirical formula of thc?

The answer I got was C7H10O, however I think I am missing a step since my answer was incorrect. This is what I did 80.16g C (1mol/12.01g)C =7 mol C 9.63g H (1mol/1.008g)H =10mol H 10.17g O... more
Ap Chemistry Science Chemistry

05/19/20

Please help! I cannot figure out the steps of going from mass of Hydrogen to moles of carbon in ethanol.

A sample of ethanol (C2H6O) contains 3.024g of hydrogen. How many moles of carbon are in the sample ? Molar Mass of ethanol (C2H6O)=46.07g/mol
Ap Chemistry Chemistry

05/13/20

Lattice energy and heat of formation

Use the following data to estimate change in heat of formation for potassium chloride.K(s) +1/2 Cl2---> KCl(s)Lattice energy= -690. kJ/molIonization energy for K = 419 kJ/molElectron affinity of... more
Ap Chemistry Chemistry Thermodynamics

05/13/20

Thermochemistry practice problem

A 5.00-g sample of aluminum pellets (specific heat capacity "0.89 J/'C ! g) and a 10.00-g sample of iron pellets (specific heatcapacity " 0.45 J/'C ! g) are heated to 100.0'C. The mixtureof hot... more
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