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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.

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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 :)

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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 :)

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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 :).

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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 :)

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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. :)

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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)

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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

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Ap Chemistry Chemistry Chem Ap Chem

09/07/20

12.3g of P4 reacts with cl2 to produce 50.0g of PCl3. what is the percent yield?

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Ap Chemistry Chemistry Chem Ap Chem

09/07/20

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

Can you please show steps as well? thank you!

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Ap Chemistry Chemistry Chem Ap 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!

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Ap Chemistry Chemistry

08/21/20

Assume that there is half as much sodium hydroxide as acetic acid in a solution. Write the equation for this reaction

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Ap Chemistry Chemistry Organic Chemistry

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%?

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Ap Chemistry Chemistry Biochemistry Organic Chemistry

05/20/20

A 0.152mol sample of CH2O2 reacted completely according to the reaction shown and 38.7 kJ of heat was released. What is delta H for this reaction?

2CH2O2+O2---->2CO2+2H2Ocan someone please explain.

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Ap Chemistry Chemistry Biochemistry Organic Chemistry

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

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Ap Chemistry Chemistry Biochemistry Organic Chemistry

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

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Ap Chemistry Science Chemistry Biochemistry

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

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Ap Chemistry Biochemistry Organic Chemistry Chem

05/19/20

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

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Ap Chemistry Science Chemistry Organic 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

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Answers •4

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

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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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Ap Chemistry Chemistry

05/12/20

Practice question for upcoming exam!!! I did it a bunch of times and my answer keeps turning out wrong...

A solution is prepared by dissolving 10.8 g ammonium sulfatein enough water to make 100.0 mL of stock solution. A10.00-mL sample of this stock solution is added to 50.00 mLof water. Calculate the... more

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Ap Chemistry Chemistry Chem Apchem

04/25/20

Titration equivlance point

Calculate the pH at the equivalence point for the titration of 4.938 M HA (a weak acid with pKa = 3.55) with 4.938 M NaOH.

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Ap Chemistry Apchem

04/25/20

Ksp solubility products

The Ksp of Fe3(PO4)2 is 4.73⋅10−20 M.Calculate the solubility of each ion in a saturated solution:

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Ap Chemistry Science Chemistry Chem

04/25/20

Rate of reaction question

I. Increasing the temperature increases the rate of a chemical reaction BECAUSE II. the activation energy is lowered. A) I is TRUE, II is FALSE B) I is FALSE, II is TRUE C) I and II are BOTH FALSE... more

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

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?

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

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

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?

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?

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

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.

12.3g of P4 reacts with cl2 to produce 50.0g of PCl3. what is the percent yield?

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

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?

Assume that there is half as much sodium hydroxide as acetic acid in a solution. Write the equation for this reaction

can some one please explain

A 0.152mol sample of CH2O2 reacted completely according to the reaction shown and 38.7 kJ of heat was released. What is delta H for this reaction?

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?

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

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?

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

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

Lattice energy and heat of formation

Thermochemistry practice problem

Practice question for upcoming exam!!! I did it a bunch of times and my answer keeps turning out wrong...

Titration equivlance point

Ksp solubility products

Rate of reaction question

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