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Chem 121

08/04/18

If you react 110.30 grams of C3H7OH in excess O2 how many grams CO2 would you form? Assume the reaction goes to completion.

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Chem 121

08/04/18

If 6.0X10^20 molecules of H2O are formed, how many molecules of O2 are reacted?

Express to 2 sig figs. Express is proper scientific notation. You can not write superscripts so format you numbers as follows: 1.0E4 or 1.0X10^4.

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Chem 121

08/04/18

If 5.55X10^23 molecules of S8 is reacted how many grams of FeS are formed?

The molecular weight of S8 is 256.48 and the molecular weight of FeS is 87.91. Express in proper scientific notation. You can not write exponents so format numbers like: 1E4 or 1X10^4. Express to 3... more

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Chem 121

11/28/17

write the complete nuclear equation for the bombardment of a ^27Al atom with an a particle to yield ^30P.

show the atomic number and mass number for each species in the equation

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Chem 121

11/28/17

the half-life of Chromium-51 is 28 days. Starting with an original size sample of 12.0 micrograms

calculate the number of days it will take for the radioactive isotope to drop to 3.00 micrograms.

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Chem 121

11/28/17

Sodium-24 has a half-life of 15.0 hours. A sample of sodium-24 with an initial mass of 22.5g was stored for 45.0 hours.

how many grams of sodium-24 is left in the sample after 45.0 hours?

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Chem 121

11/28/17

1) what is the daughter nucleus when ^227Th undergoes alpha decay?

2) what is the daughter nucleus produced when ^227Ac undergoes beta decay by emitting an electron?

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Chem 121

11/20/17

calculate either [H3O+] or [OH-] for the solutions below.

1)[OH-] = 1.77 x 10^-7 M [H3O+] = ?M 2)[H3O+] = 8.25 x 10^-9 [OH-] = ?M 3)[H3O+] = 0.000653 M [OH-] = ?M

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Chem 121

11/20/17

using chemical equations, show how the triprotic acid H3PO4 ionizes water.

Ka1= Ka2= Ka3=

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Chem 121

11/20/17

complete this equation. LiOH(s) ->

include the state of the product

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Chem 121

11/20/17

the flask contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. the buret contains 0.310 M NaOH.

1) what volume of NaOH is needed to reach the end point of the titration? 2)what was the initial concentration of HCl?

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Chem 121

11/20/17

a solution contains 0.750 g of Ca2+ in enough water to make a 1875 mL solution

what is the milliequivalent of Ca2+ per liter (mEq/L) for this solution?

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Chem 121

11/17/17

calculate the value of pKa for the acid HA

[HA] = 0.120 M [H+] = 3.00 x 10^-4 M [A-] = 3.00 x 10^-4 M

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Chem 121

11/17/17

what are the concentrations go H3O+ and OH- in oranges that have a pH of 3.71?

H3O+ = ?M OH- = ?M

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Chem 121

11/17/17

calculate pH for each H3O+ concentration

a) [H3O+] = 1 x 10^-7 M pH= ? b) [H3O+] = 0.1 M pH= ? c) [H3O+] = 1 x 10^-13 pH= ?

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Chem 121

11/17/17

what is the formula for the salt that forms?

HNO3(aq) + Ba(OH)2(aq) ->

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Chem 121

11/17/17

write the balanced molecular equation for the neutralization reaction between H2SO4 and KOH in aqueous solution

phases are optional

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Chem 121

11/11/17

how many grams of sucrose are needed to make 675 mL of a 37.0% (w/v) sucrose solution?

answer must be in g sucrose

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Chem 121

11/09/17

calculate the number of moles of solute

14.03 mL of 0.1755 M K2Cr2O7 (aq)

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Chem 121

11/09/17

calculate the molarity of the two solutions.

1) 0.550 mol of NaOH in 2.35 L solution 2) 10.9 g of NaCl in 887 mL of solution

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Chem 121

11/09/17

calculate the molarity of 0.350 mol of Na2S in 1.85 L of solution.

also, calculate the molarity of 28.3 g of MgS in 795 mL of solution.

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Chem 121

11/09/17

how many grams of sucres are needed to make 675 mL of a 37.0% (w/v) sucrose solution?

answer must be g/sucrose

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Chem 121

11/09/17

how many grams of CaCl2 are needed to make 597.9 g of a solution that is 31.0% (m/m) calcium chloride in water?

note that mass is not technically the same thing as weight, but % (m/m) has the same meaning as % (w/w). how many grams of water are needed to make this solution?

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Chem 121

11/07/17

isopropyl alcohol is mixed with water to produce a 37.0% (v/v) alcohol solution. how many milliliters of each component are presented in 835 mL of the solution?

assume that volumes are additive. need answer for mL alcohol and mL water

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Chem 121

11/07/17

it is desired to make a solution that is 3.0% by mass NaCl. if 160 g NaCl are available, what mass of solution can be prepared?

answer must be in grams

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Answers •1

If you react 110.30 grams of C3H7OH in excess O2 how many grams CO2 would you form? Assume the reaction goes to completion.

If 6.0X10^20 molecules of H2O are formed, how many molecules of O2 are reacted?

If 5.55X10^23 molecules of S8 is reacted how many grams of FeS are formed?

write the complete nuclear equation for the bombardment of a ^27Al atom with an a particle to yield ^30P.

the half-life of Chromium-51 is 28 days. Starting with an original size sample of 12.0 micrograms

Sodium-24 has a half-life of 15.0 hours. A sample of sodium-24 with an initial mass of 22.5g was stored for 45.0 hours.

1) what is the daughter nucleus when ^227Th undergoes alpha decay?

calculate either [H3O+] or [OH-] for the solutions below.

using chemical equations, show how the triprotic acid H3PO4 ionizes water.

complete this equation. LiOH(s) ->

the flask contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. the buret contains 0.310 M NaOH.

a solution contains 0.750 g of Ca2+ in enough water to make a 1875 mL solution

calculate the value of pKa for the acid HA

what are the concentrations go H3O+ and OH- in oranges that have a pH of 3.71?

calculate pH for each H3O+ concentration

what is the formula for the salt that forms?

write the balanced molecular equation for the neutralization reaction between H2SO4 and KOH in aqueous solution

how many grams of sucrose are needed to make 675 mL of a 37.0% (w/v) sucrose solution?

calculate the number of moles of solute

calculate the molarity of the two solutions.

calculate the molarity of 0.350 mol of Na2S in 1.85 L of solution.

how many grams of sucres are needed to make 675 mL of a 37.0% (w/v) sucrose solution?

how many grams of CaCl2 are needed to make 597.9 g of a solution that is 31.0% (m/m) calcium chloride in water?

isopropyl alcohol is mixed with water to produce a 37.0% (v/v) alcohol solution. how many milliliters of each component are presented in 835 mL of the solution?

it is desired to make a solution that is 3.0% by mass NaCl. if 160 g NaCl are available, what mass of solution can be prepared?

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