09/28/20

Consider the reaction:
Consider the reaction i. Which is the limiting reactant if we start with 114 g of Al (26.98 g/mol) and 186 g of (70.9 g/mol)?ii. How much  (133.34 g/mol) can be made at most from these amounts of... more
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09/28/20

Determine the mass of water that will be obtained from combustion of 200.g of propane.
Consider the combustion of propane (44.1 g/mol) in the presence of excess oxygen.Determine the mass of water that will be obtained from combustion of 200.g of propane.C3H8 + 5O2 = 4H2O + 3CO2
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09/28/20

Water from the tap is a mixture that contains dissolved minerals. Sometimes having pure water is necessary. What is the best way to remove the dissolved minerals from the water?
A. FiltrationB. DistillationC. Chromatography D. Evaporation
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09/28/20

What volume in mL of 0.3750M HCl is required to neutralize 50.00 mL of 0.8000 M NaOH?
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09/28/20

Significant figures

What is 9.057194 cm3 rounded to the correct number of significant figures ?
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09/27/20

Chemistry: Balance equation, find volume of produce, and percent yield.
B2O3(s)+ C(s)+Cl2(g)=BCl3(l)+CO(g)1.) Write the balanced molecular reaction. Include phases.2.) Assume that excess carbon is present .0.456 g of B2O3 reacts with 7.89 L of Cl2(g) at standard... more
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09/27/20

If you wish to obtain 4.20 g of copper metal from copper(II) sulfide, what mass of (in grams) must you use?
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09/26/20

Nitrogen and hydrogen reacted to form 4.00 g of NH3 with 35.5 % yield. If 1.05 g of nitrogen remained unreacted, how much nitrogen must have been present at the start?

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09/26/20

Buffers- Chemistry
A buffer is prepared by adding 12.0 g lactic acid (MW = 90.1 gmol-1), and 10.0 g sodium lactate (MW = 112 gmol-1), to enough water to form a 500 mL solution. The Ka of lactic acid is 1.38 x 10–4.a)... more
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09/26/20

what amounts of each species is expected to be present?

 2.5 g of solid aluminum and 2.5 g of gaseous oxygen react in a combination reaction to produce aluminum oxide. At the end of the experiment, what amounts of each species is expected to be present?
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09/26/20

How many grams of sodium sulfide are formed if 1.25 g of hydrogen sulfide is bubbled into a solution containing 2.00 g of sodium hydroxide, assuming that the sodium sulfide is made in 92.0 % yield?
 When hydrogen sulfide gas is bubbled into a solution of sodium hydroxide, the reaction forms sodium sulfide and water. How many grams of sodium sulfide are formed if 1.25 g of hydrogen sulfide is... more
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09/26/20

(C4H6O3): C7H6O3 + C4H6O3 --> C9H8O4 + HC2H3O2
Aspirin (C9H8O4) is produced from salicylic acid (C7H6O3) and acetic anhydride (C4H6O3): C7H6O3 + C4H6O3 --> C9H8O4 + HC2H3O2. What is the percent yield of the reaction where 0.185 Mg of... more
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09/26/20

The half-life of a certain radioactive element is 800 years. How old is an object if only 12.5% of the radioactive atoms in it remain?
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09/25/20

Chemistry: Precipitation Reaction
Consider the precipitation reaction from Na3PO4(aq) and CuCl2(aq).2 Na3PO4(aq) + 3 CuCl2(aq) →  Cu3(PO4)2(s) +6 NaCl(aq)What volume in mL of 0.17 M CuCl2 solution is necessary to completely react... more
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09/25/20

What is the freezing point?
What is the freezing point (in degrees Celcius) of 4.47 kg of water if it contains 226.7 g of CaBr2CaBr2? The freezing point depression constant for water is 1.86 oC/m and the molar mass... more
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09/25/20

What mass, in grams, of NaCl needs to be added to 1.6 kg of water in order to create a solution with a freezing point of -5.6 °C? The freezing point depression constant of water is 1.86 ºC/m
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09/25/20

Calculate the molarity of the unknown HCl from a 1.750 M NaOH solution in a trial where 25.59 mL was the volume titrated.
At the equivalence point of the titration, moles NaOH added = moles HCl present, so M(NaOH)*V(NaOH)=M(HCl)*V(HCl).
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09/25/20

Hess' Law chemistry
Given the following equationsH2(g) + 1/2 O2(g)  H2O(l)      ΔH = -285.8 kJN2O5(g) + H2O(l)  2 HNO3(l)      ΔH = -76.6 kJ1/2 N2(g) + 3/2 O2(g) + 1/2 H2(g)  HNO3(l)      ΔH = -174.1 kJCalculate... more
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09/25/20

 Stoichiometry topic
1.How many moles of sodium are in a frozen pizza containing 4.20 g? 2.How many molecules of the fictional metal adamantium are in 853 moles (the approximate number of moles of metal found in... more
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09/24/20

The radioisotope ¹⁴C (half life = 5730 years) is used for carbon dating. What is the first order rate constant for ¹⁴C?
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09/24/20

What is the rate at which Br⁻(aq) disappears in the reaction below if the rate of disappearance of BrO₃⁻(aq) is 0.072 M/s? BrO₃⁻ + 5 Br⁻ + 6 H⁺ → 3 Br₂ + 3H₂O
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09/24/20

What is the rate constant of a first-order reaction when 20.0% of a reactant remains after 35.5 s?
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09/24/20

How do I solve this??
Hey sample of aluminum oxide contains 5.33×1022 Atoms . How many aluminum atoms and how many oxygen Atoms are presented? How many grams of aluminum are present in the sample
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09/24/20

For chromatographs that display two or more components (spots), how does Rf relate to the polarity of the component?
This is in organic chemistry and the topic is on thin layer chromatography
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09/24/20

All antibody based methods to quantify protein levels are so specific you don’t need controls?
True or false?I think its true since we need controls to determine certain methods?
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