25,963 Answered Questions for the topic chemistry

Chemistry

03/28/23

Calorimetry....
A 57.28 gram sample of iron (with a heat capacity of 0.450 J/gºC) is heated to 100.0 ºC. It is then transferred to a coffee cup calorimeter containing 47.53 g of water (specific heat of... more
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Chemistry

03/28/23

Calorimetry.....
You order a 16 oz glass of tea (where the mass of Tea is 474 grams) from a local restaurant. The tea is freshly brewed and has an initial temperature of 22.13 °C. You add ice to cool it. If the... more
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Chemistry

03/28/23

Calorimetry....
How much heat (in joules) is used to heat a 79.00 gram sample of iron from 0.580 degrees Celcius to 100.00 degrees Celcius if the specific heat of Fe is 0.450 J/g°C?
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Chemistry

03/28/23

Calorimetry....
A 25.00 gram sample of an unknown metal initially at 99.0 degrees Celcius is added to 50.00 grams of water initially at 8.75 degrees Celcius. The final temperature of the system is 20.15 degrees... more
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Chemistry

03/28/23

Calorimetry.....
An unknown sample is being evaluated in lab. What is the specific heat capacity of the compound if it requires 372.19 J to raise the temperature of 78.36 grams of the unknown from 15.2 °C to 34.5 °C
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Chemistry

03/28/23

Calorimetry....
Calculate the final temperature of the system: A 50.0 gram sample of water initially at 100 °C and a 100 gram sample initially at 2.86 °C are mixed. The specific heat of water is 4.184 J/g°C.
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Chemistry

03/28/23

Calorimetry.....
Calculate the internal energy (in Joules) of an endothermic system that absorbs 356.3 J and expands from 1.00 to 6.830 L against a pressure of 5.48 atm.
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Chemistry

03/28/23

Calorimetry.....
A sample of gas is placed into an enclosed cylinder and fitted with a movable piston. Calculate the work (in joules) done on the gas if it is compressed from 15.43 L to 8.56 L with a pressure of... more
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Chemistry

03/28/23

Calorimetry....
A sample of flammable liquid is placed into an enclosed cylinder which is then fitted with a movable piston. Initially the cylinder contains a volume of 7.30 L. The sample is ignited producing gas... more
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Chemistry

03/28/23

1 g of a gas occupies 300ml at 250C and 99 KPa.

1 g of a gas occupies 300ml at 250C and 99 KPa. Find the following: Number of moles The molecular mass
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Chemistry

03/28/23

How many litres of O2 will be produced at a temperature of 37 degrees Celsius and 1520 torr if 2 moles of KCIO3 decompose according to the following balanced equation?
How many litres of O2 will be produced at a temperature of 37 degrees Celsius and 1520 torr if 2 moles of KCIO3 decompose according to the following balanced equation?2KCIO3 -> 2KCI + 3O2
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Chemistry

03/28/23

Oxyacetylene torches are used for welding at temperature close to 200°C.These temperatures are due to combustion of acetylene with oxygen.
Oxyacetylene torches are used for welding at temperature close to 200°C.These temperatures are due to combustion of acetylene with oxygen.C2H2 (g) + O2 (g) -> CO2 (g) + H2O (g)a) Balance the... more
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Chemistry

03/28/23

Chemistry chemical reactions
A reaction vessel contains 7.10 g of CO and 7.10 g of O2. How many grams of CO2 could be produced according to the following reaction?2CO+O2​2CO2​
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Chemistry

03/27/23

What is the Possible Energy Collected in kJ if the power striking an oven 53.2 cm by 44.5 cm is 1071.5 watt/meters squared over 60.9 minutes?
Please round to 3 sig figs but use the following format. Ex: XXX0 if greater than 1000 or XXX if less than 1000. X.XXEX also works either way
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Chemistry

03/27/23

Br₂(g) ⇌ 2 Br･(g) Kp = 2.48 × 10⁻³ at 1650 °C. A 5.00 L vessel at 1650 °C is filled with Br₂(g) at an initial pressure of 5.00 atm equilibrium. Pressure (in atm) of Br･(g) at equilibrium?
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Chemistry

03/27/23

Based on zinc's and silver's placement on the activity series, which of these reactions should be spontaneous? Balance that equations.
Ag+ + Zn = Ag + Zn2+Zn2+ + Ag = Zn + Ag+
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Chemistry

03/27/23

Rank the three halides (X-), Cl2, Br2 and I2 in order of increasing strength as reducing agents.
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Chemistry

03/27/23

A 55.0g sample of a metal at 100 degree C is dropped into 100.0g of water at 25.0 degrees the temperature of the water increases to 28.5 degrees C.

Determine the specific heat of the metal when the specific heat of water is 4.184 J/g degrees C
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Chemistry

03/27/23

Vaporizing 5.00g of H2O(l) requires 12.2 kj. What is the molar heat of vaporization of water when water's specific heat is 4.184 J/g degrees C
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Chemistry

03/27/23

How much heat energy is needed to heat 200.0 g of water from 10.0 degrees C to 50.0 degrees C, with 4.184 J/g degreesC
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Chemistry

03/27/23

2NaN3 (s) --> 3N2(g)+2Na(s) If an airbag fills with 3.75 mol of nitrogen gas, 1) How many moles of sodium azide are decomposed? 2) What is the mass of sodium produced?

I need the answer to part one and part 2 of this question.part one is: how many moles of sodium azide is decomposed?part two is: what is the mass of sodium produced?
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Chemistry

03/27/23

Solution calculation

12.5g potassium sulfate in 50.0L h2O describe the components, and give mass percent, mole percent, molarity, molality
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Chemistry

03/27/23

By what factor should you dilute the 1.00M NaOH stock solution so that you will reach the first equivalence point in about 10mL?
It takes 2.1 mL of 1.00M NaOH (aq) stock solution to reach the second equivalence point in a titration of 50.0mL of phosphoric acid solution. By what factor should you dilute the 1.00M NaOH stock... more
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Chemistry

03/27/23

What is the concentration of the phosphoric acid solution?
A student measures that it takes 7.21mL of 0.326 M NaOH (aq) solution to reach the first equivalence point of a titration of 100.0 mL of phosphoric acid solution. He also notes that it takes a... more
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Chemistry

03/27/23

how to find the specific heat
A 63.4-gram piece of metal is heated to 90.9 °C. It is placed into 50.0 g water with an initial temperature of 20.1 °C. After stirring, the final water temperature is 38.8 °C. What is the specific... more
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