09/15/22

If the initial concentration of N2O5 is 0.117 M, the concentration of N2O5 will be 3.12×10-2 M after ______s have passed.
The gas phase decomposition of dinitrogen pentoxide at 335 KN2O5(g)2 NO2(g) + ½ O2(g)is first order in N2O5 with a rate constant of 4.70×10-3s-1.If the initial concentration of N2O5 is 0.117 M, the... more
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09/15/22

The reaction of nitrogen monoxide with ozone at 25 °C
The reaction of nitrogen monoxide with ozone at 25 °CNO + O3 ---> NO2 + O2is first order in NO and first order in NO .Complete the rate law for this reaction in the box below.Use the... more
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09/15/22

Rate = ________
The reduction of nitric oxide with hydrogen2NO + 2H2 ---> N2 + 2H2Ois second order in NO and third order overall.Complete the rate law for this reaction in the box below.Use the form , where '1'... more
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09/15/22

Based on these data, the rate constant for the reaction is _______ M s-1.
The decomposition of hydrogen iodide on a gold surface at 150 °CHI(g)½ H2(g) + ½ I2(g)is zero order in HI.In one experiment, when the initial concentration of HI was 8.29×10-2 M, the concentration... more
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09/15/22

Based on this plot, the reaction is __________ order in HI and the rate constant for the reaction is _______ M s-1.
In a study of the decomposition of hydrogen iodide on a gold surface at 150 °CHI(g)½ H2(g) + ½ I2(g)the concentration of HI was followed as a function of time.It was found that a graph... more
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09/15/22

How many mmol of KIO3 is this?
A student crushed a vitamin C tablet that weighed 1.634g, and transferred 1.552g of the powder into a 100 mL volumetric flask. After diluting to the 100.00mL mark, they titrated a 20.00mL aliquot... more
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09/15/22

Use the stoichiometry of this reaction to calculate the mmol of I2 generated.
A student crushed a vitamin C tablet that weighed 1.634g, and transferred 1.552g of the powder into a 100 mL volumetric flask. After diluting to the 100.00mL mark, they titrated a 20.00mL aliquot... more
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09/15/22

Arrange the elements according to atomic radius. Si, Pb, C, Ge, Sn
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09/15/22

If the concentration of a protein is 600 micromole per liter, and its molecular mass is 68,500 g/mol, what is the concentration of this protein in units of milligrams per cubic centimeters.

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09/14/22

When mixed two cations and two anions write the Net precipitation reaction that occurs.
The two solutions, when mixed, will have two cations and two anions.(c) Based on your lab results, enter the cation and anion for which a precipitate will form. (Separate substances in a list with... more
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09/14/22

What is the dissolution reaction for the ionic solid Na_2CO_3
During lab, students mixed two solutions of soluble ions in a ceramic well to determine if a precipitate forms.Write the dissolution reaction for the ionic solids below. (Use the lowest possible... more
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09/14/22

What mass of helium is contained in the cylinder?
A gas cylinder that contains helium has an internal volume of 6.88 L.6.88 L. A pressure gauge attached to the cylinder... more
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09/14/22

If 0.5 g of a drug sample were dissolved in 25 mL solvent, how would you describe its solubility?
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09/13/22

Determine how many moles of O2 are required to react completely with 7.4 mol C8H18 .

Determine how many moles of O2O2 are required to react completely with 7.4 molmol C8H18C8H18. 
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09/13/22

How many atoms of copper are in a toy top?
A toy top has a mass of 32.0g Cu. How many atoms of Cu are in this spinning top, given that the average atomic mass of copper is 63.55 amu?
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09/13/22

Chemistry Question
When is it better to use a graduated cylinder instead of volumetric pipets or beakers when measuring volume?
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09/13/22

A compound is 54.53% C, 9.15% H, and 36.32% O by mass. What is its empirical formula? The molecular mass of the compound is 132 amu. What is its molecular formula?
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09/13/22

A sample of trifluoroacetic acid, C2HF3O2, contains 53.7 g of fluorine. Calculate the mass of the trifluoroacetic acid sample.
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09/13/22

Chemistry question
A Solution Of Table Salt In Water Contains 15.3% By Mass Of Table Salt.If 437g Of Solution Are Evaporated To Dryness How many grams of table salt will remain?
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09/13/22

A 42.30 g sample of liquid lead at 505.00°C is poured into a mold and allowed to cool to 28.00°C. How many kJ of energy are released in this process?
The following information is given for lead at 1atm:  = 1740.00°C (1740.00°C) =  J/g  = 328.00°C (328.00°C) =  J/g Specific heat solid = 0.1300 J/g °C Specific heat liquid = 0.1380 J/g... more
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09/13/22

kJ are required to melt a 43.5 g sample of solid silicon, Si, at its normal melting point.
The following information is given for silicon at 1 atm: boiling point = 2355 °C Hvap(2355 °C) = 297 kJ/mol melting point = 1410 °C Hfus(1410 °C) = 46.4 kJ/mol specific heat solid... more
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09/13/22

He heats 19.6 grams of gold to 98.44 °C and then drops it into an insulated cup containing 83.0 grams of water at 20.91 °C.

adding the last part of the question here, could not fit in title. When thermal equilibrium is reached, he measures the final temperature to be 21.46 °C.Assuming that all of the heat is... more
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09/13/22

A chunk of tin weighing 18.8 grams and originally at 97.21 °C is dropped into an insulated cup containing 78.5 grams of water at 21.84 °C.

Assuming that all of the heat is transferred to the water, the final temperature of the water is  °C.determine csp or t final: thermal equilibrium in metal + water
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09/13/22

Chemistry Question
How much caffeine will need to be weigh out and diluted to 250mL to prepare a concentration of 0ppm, 20ppm, and 40ppm?
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09/13/22

What is the energy change when the temperature of 10.0 grams of solid graphite is decreased from 39.0 °C to 23.8 °C?
specific heat to energy or temperature.
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