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4 years ago

Sound _____.

Chemistry

2 answers:

zlopas [31]4 years ago

5 0

The answer is the first one that say Travels in longitudinal waves

valkas [14]4 years ago

3 0

It travels in longitudinal waves.

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A 21.8 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter, according to the following reaction. If the temperature ris

Blababa [14]

Answer: The heat capacity of calorimeter is $15.66J/^oC$

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of ethanol = 21.8 g

Molar mass of ethanol = 46.07 g/mol

Putting values in above equation, we get:

$\text{Moles of ethanol}=\frac{21.8g}{46.07g/mol}=0.473mol$

To calculate the enthalpy change of the reaction, we use the equation:

$\Delta H_{rxn}=\frac{q}{n}$

where,

$q$ = amount of heat released = ?

n = number of moles = 0.473 moles

$\Delta H_{rxn}$ = enthalpy change of the reaction = -1235 kJ/mol = $-1235\times 10^3J/mol$ (Conversion factor: 1 kJ = 1000 J)

Putting values in above equation, we get:

$-1235\times 10^3J/mol=\frac{q}{0.473mol}\\\\q=(-1235\times 10^3J/mol\times 0.473mol)=-584.16\times 10^3J$

To calculate the heat capacity of calorimeter, we use the equation:

$q=c\Delta T$

where,

q = heat absorbed by the calorimeter = $584.16\times 10^3J$

c = heat capacity = ?

$\Delta T$ = change in temperature = $T_2-T_1=62.3^oC-25^oC=37.3^oC$

Putting values in above equation, we get:

$584.16\times 10^3J=c\times 37.3^oC\\\\c=\frac{584.16\times 10^3J}{37.3^oC}=15.66J/^oC$

Hence, the heat capacity of calorimeter is $15.66J/^oC$

4 0

4 years ago

What would be the mass, in grams, of 3.50 x 1025 molecules of chlorine? Show your work

Maurinko [17]

Answer:

2059.645g Cl

Explanation:

A mole of any element contains 6.022e23 molecules, so we will divide the given amount of molecules by 6.022e23.

3.5e25 / 6.022e23 = 5.81e1

5.81e1 = 58.1 mol Cl

Now that we have found the amount of moles of Chlorine, we will multiply the number of moles by the molar mass of Chlorine, which is 35.45g/mol.

35.45(58.1) = 2059.645g Cl

4 0

3 years ago

In an addition reaction, which bond of the reactant is broken?

Kitty [74]

Answer: c

Explanation:

A reaction in which two or more molecules combine together to result in the formation of a larger molecules then this type of reactions are known as addition reactions.

3 0

2 years ago

Read 2 more answers

A 12.2-g sample of x reacts with a sample of y to form 78.9g of xy. what is the mass of y that reacted?

Jet001 [13]

The chemical reaction would most likely be written as:

X + Y = XY

We cannot simply use the usual method of converting grams to moles since we do not have any idea on what are the identities of X and Y. The only method we could use is to use the law of conservation of mass where mass inflow in a process should be equal to the mass out in the process. The total inflow of mass would be the mass of X and Y and the outflow would be the product XY.

g X + g Y = g XY
12.2 g + g Y = 78.9 g XY
g Y = 66.7 g

7 0

4 years ago

On the pH scale pure water has a pH of A. 0 B. 7 C. 14

konstantin123 [22]

Answer:its b 7

Explanation:

7 is neutral and pure water is the middle man

7 0

4 years ago

Read 2 more answers