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2 years ago

The Kelvin temperature required for 0.0470 mol of helium gas to fill a balloon to 1.20 L under 0.878 atm is

1 answer:

7 0

From the ideal gas law, PV = nRT, we can rearrange the equation to solve for T given the other parameters.

T = PV/nR

where P = 0.878 atm, V = 1.20 L, n = 0.0470 moles, and R = 0.082057 L•atm/mol•K. Plugging in our values, we obtain the temperature in Kelvin:

T = (0.878 atm)(1.20 L)/(0.0470 mol)(0.082057 L•atm/mol•K)
T = 273 K

So, the second answer choice would be correct.

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How many miles of C5H12 are there in 362.8 grams of the compound?

Dmitry_Shevchenko [17]

Answer:

5.03 moles

Explanation:

Find the molar mass of C5H12 and you will get 72.17 g/mol

Next to find the number of moles, you divide 362.8 by the molar mass and you get

(362.8 g)/(72.17 g/mol)= 5.03 moles

3 0

2 years ago

Silver nitrate reacts with calcium to make calcium nitrate and silver. The reaction is exothermic and produces 18.7 kJ/mol of en

denis-greek [22]

Answer:

1.63 kilo Joules of energy will be produced when 14.8 g of silver nitrate react.

Explanation:

$AgNO_3+Ca\rightarrow Ag+CaNO_3,\Delta H_{rxn}=-18.7 kJ/mol$

Mass of silver nitrate = 14.8 g

Moles of silver nitrate = $\frac{14.8 g}{170 g/mol}=0.08706 mol$

According to reaction, when 1 mole of silver nitrate reacts with 1 mole of calcium it gives 18.7 kJ of heat.

Then amount of heat released when 0.08706 moles of silver nitrate reacts :

$0.08706\times 18.7 kJ=1.628 kJ\approx 1.63 kJ$

1.63 kilo Joules of energy will be produced when 14.8 g of silver nitrate react.

6 0

2 years ago

How can the periodic table predict properties of elements?

Murrr4er [49]

A major factor in how the periodic table is organized is the configuration of each element's valence electrons. Because elements in each family have the same number of valence electrons, they tend to have several similar characteristics.

3 0

2 years ago

How many molecules are in 3.3 moles of ethane gas C2H6? Check your significant figures. A. 1.97 x 1024 molecules C2H6 B. 2.0 x 1

MArishka [77]

Explanation:

2..0×1024 molecules c2 h6

3 0

2 years ago

5) Determine the mass in grams of 4.82 moles of water molecules if the molar mass of

Dmitry [639]

Answer:

86.9 g

Explanation:

Use the conversion factor: 4.82 mol H2O x (18.02g H2O/1 mol H2O)

The moles cancel out so we have to multiply 4.82 x 18.02 = 86.9

The answer is 3 sig. figs.

5 0

2 years ago