CHEMISTRY HIGH SCHOOL

.A pure gas that is 14.3% hydrogen and 85,7% carbon by mass has a density of 2.5 g L-' at 0°C and 1 atm
pressure. What is the molecular formula of the gas

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Answer 1
Answer:

Answer:

C

Explanation:

4× CH2 = C4H8

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Pentane, C5H12, will react as shown below:____C5H12(l) + ____O2 --- ______CO2 +_______ H2OH20(g)1. Balance the equation above by putting coefficients into each blank space.1C5H12+ 8O2----- 5CO2+ 6 H2O (this is what I got)2. How many atoms of oxygen are in 144 grams of pentane?step 1: 144g of C5H12*(1mole/72.17)= 1.995moles of C5H12step 2: 1.995moles of C5H12*(8moles of O2/1mole of C5H12)= 15.962 moles of O2step 3: 15.962 moles of O2*(6.02*10^23 atoms of O2/1mole of O2)= 9.609*10^24 atoms of O2 (I don't know if I did this right)3. How many atoms of oxygen are in 192 grams of carbon dioxide gas?step 1: 192 grams of CO2 *(1mole of CO2/44.01grams of CO2)= 4.363 moles of CO2step two: 4.36moles of CO2* ( 1 mole of O2/1mole of CO2)= step 3: 4.363* (6.02*10^23) = 2.627*10^24 atoms of O2 (I don't know if this is correct.4. A) CIRCLE ONE: True or False:reactant you begin with fewer grams of is your limiting reactant.B) If 32 g of oxygen gas and 32 g of pentane are combined, how much water will be produced, in moles? (Use your reaction from the top of the first page)NEED HELP ASAP THANK YOU!!!
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A student made a copper bracelet by hammering a small copper bar into the desired shape. The bracelet has a mass of 30.1 grams and was at a temperature of 21°C in the classroom. After the student wore the bracelet, the bracelet reached a temperature of 33°C. Later, the student removed the bracelet and placed it on a desk at home, where it cooled from 33°C to 19°C. The specific heat capacity of copper is 0.385 J/g•K.69 Explain, in terms of heat flow, the change in the temperature of the bracelet when the student wore the bracelet. [1]

70 Determine the number of moles of copper in the bracelet. [1]

71 Show a numerical setup for calculating the amount of heat released by the bracelet as it cooled on the desk. [1]

72 Explain, in terms of chemical activity, why copper is a better choice than iron to make the bracelet. [1]

Answers

69. The student's skin was obviously warmer than the initial temperature of the bracelet. According to the second law of thermodynamics, heat transfers from a higher temperature to a lower temperature. Hence, heat transfers from the student's skin to the bracelet warming up the bracelet.  

70. To determine number of moles of copper:

Given mass=30.1 grams

Molar mass= 63.55 g/mol

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\n\n \text{Number of moles}=(30.1)/(63.55) =0.4736 \text { moles}

Thus, the number of moles of copper is 0.4736.

71. Calculating the amount of heat released:

ΔH( heat released) = m Cp(ΔT)

= 30.1g(0.385 J/g. K)(33-19)K

ΔH= 162.23J

Thus, the amount of heat released is 162.23 J.

72. Copper is chemically less active than iron.

Copperdoes notdisplace iron from its solution since it is less reactive than iron. A more reactive metal displaces a less reactive metal from its solution.

Learn more:

brainly.com/question/25548593
69. The student's skin was obviously warmer than the initial temperature of the bracelet. According to the second law of thermodynamics, heat transfers from a higher temperature to a lower temperature hence heat transfers from the student's skin to the bracelet warming up the bracelet. 

70. moles of copper=mass of copper/molar mass of copper
=30.1g/(63.55g/mol)= 0.4736 moles Cu

71. Delta H( heat released) = mCp(deltaT) = 30.1g(0.385 J/gK)(33-19)K = 162.23J

72. Copper is chemically less active than iron. 

Chemical buffers are compounds that will bind (click to select) when they are in abundance in a solution. This prevents an unwanted drop in pH. True False

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