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439 Answered Questions for the topic AP chemistry

Ap Chemistry Chemistry

1d

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

1d

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

1d

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

1d

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

1d

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

1d

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

1d

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

1d

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 Chem

1d

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

1d

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

6d

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

12d

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

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

12d

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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