05/13/20

College Chemistry Help please

What volume (mL) of a 4% (m/v) NaOH solution contains 15 g NaOH?A) 3.75 mLB) 375 mLC) 13 mLD) 120 mL
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05/13/20

In an experiment, 201 mL of wet hydrogen gas is collected over water at 27 degrees Celsius and a barometric pressure of 733 torr. What is the partial pressure of hydrogen in this experiment in atm?

vapor pressure of water at 27 degrees Celsius is 26.74 torr. Zinc reacts with aqueous sulfuric acid to form hydrogen gas.
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05/13/20

In an experiment, 225 mL of wet hydrogen gas is collected over water at 27 degrees Celsius and a barometric pressure of 748 torr. How many grams of Zn have been consumed?
The vapor pressure of water at 27 degrees Celsius is 26.74 torr. Zn (s) = H2SO4 (aq) yeilds ZnSo4 (aq) + H2 (g)
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05/13/20

Which ions are most abundant in a base?
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05/13/20

Which ions are most abundant in an acid?
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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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05/13/20

number of molecules of SO2Cl2 remaining after 12.5 h
Sulfuryl chloride undergoes first- order decomposition at 320°C with a half-life of 8.75 hSO2Cl2 (g) à SO2 (g) + Cl2 (g)a.) What is the value of the rate constant, k, in 1/sec?b.) If the... more
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05/13/20

mass of nitrogen was produced
Nitromethane, CH3NO2, can be used as a fuel. When the liquid is burned, the (unbalanced) reaction is mainlyCH3NO2 (l) + O2 (g) à CO2 (g) + N2 (g) + H2O (g)a.) The standard enthalpy... more
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05/13/20

total mass of water formed NEED ANSWER FOR PART B
Natural gas is a mixture of hydrocarbons, primarily methane (CH4) and ethane (C2H6). A typical mixture might have Xmethane= 0.915 and Xethane = 0.085.    (R= 0.0821 L atm/mol K)a.) What... more
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05/13/20

A radioisotope has a half-life of 5 minutes. Initially, 10 g was present. What amount of the original atoms will be unchanged after 5 minutes?
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05/13/20

Need Help With Chem
If 22.5 L of nitrogen at 748 mm Hg are compressed to 725 mm Hg at constant temperature. What is thenew volume?
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05/13/20

A saturated solution of Be(OH)2 was found to contain 1.8 ✕ 10−8 mol OH − in 100.0 mL. Calculate the Ksp of Be(OH)2.

A saturated solution of Be(OH)2 was found to contain 1.8 ✕ 10−8 mol OH− in 100.0 mL. Calculate the Ksp of Be(OH)2. 
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05/13/20

The literature Ksp value for Mg(OH)2 is 1.8 ✕ 10−11.
The literature Ksp value for Mg(OH)2 is 1.8 ✕ 10−11.(a) Calculate the theoretical [OH− ] in a saturated solution of Mg(OH)2. Answer in M(b) What volume of 0.00210 M HCl would be required to... more
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05/12/20

URGENT!! TELL ME THE FORMULA

on a glass of 20g of copper oxide(II) is added 0.2dm3 h2so4,caclulatr the amount of CuSO4 formed by this reaction?
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05/12/20

Stoichiomerty combustion of acetylene
Grams of oxygen (o2) take to produce 9.60 mole of carbon dioxide (CO2)?
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05/12/20

The volume of the oxygen sample collected was 720. mL at 25.0℃ and a barometric pressure of 755 torr. What would the volume of the oxygen be at STP?

A certain mass of oxygen was collected over water when potassium chlorate was decomposed by heating. The volume of the oxygen sample collected was 720. mL at 25.0℃ and a barometric pressure of 755... more
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05/12/20

HClO is what type of acid/base?

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05/12/20

If 157 mL of C2H2(g) is collected over water at 22℃ and a barometric pressure of 745 torr, how many grams of CaC2 (s) have been consumed?
Acetylene gas, (C2H2 (g),) can be produced by the reaction of calcium carbide with water:   CaC2 (s)  + 2H2O (l)  ------------>  Ca(OH)2 (s)  + C2H2(g)
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05/12/20

Have I done it correctly?

Hi!I need to know I am thinking correctly in this question, thanks in advance :)Does this following reaction occur spontaneously?Fe3+ + Ag(s) + Cl- --> Fe2+ + AgCl (s)I found that Fe2+ ---->... more
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05/12/20

Acid base and pH
Determine the hydroxide ion concentration in a solution that is 0.0028 M HNO3.
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05/12/20

Rank the following salts in order of increasing pH value of equimolar solutions: NaCN, KCl, NH4Cl.
I'm not sure how to determine their pH just based off of their formula, could you please provide some information on how to solve other problems like these.
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05/12/20

Acud Base PH, POH
For a solution with a pH of 4, what would be the value of [H^+] , [OH^−] and pOH, respectively?
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05/12/20

Acid base and pH
Determine the hydronium ion concentration in a solution that is 0.0028 M HNO3.
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05/12/20

Acid base and pH
Determine the hydronium ion concentration in a solution that is 0.0001 M HCl.
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05/11/20

1. Metallic aluminum burns with bromine according to the following balanced equation: 2 Al (s) + 3 Br2 (l) → 2 AlBr3

Determine the mass of AlBr3 that will be produced from the reaction of 100. g aluminum and excess of bromine.
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