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1 year ago

How many moles of potassium iodide (KI) are in 48.9 g of potassium iodide (KI) ? ____ moles

Chemistry

1 answer:

wel1 year ago

5 0

Answer:

mass of kI = 74.55 Atomic mass

74.55 g ---> 1 mole

48.9 g --> ?

48.9 / 72

0.7 mole.

In one mole of kI --->

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2 years ago

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Answer:

$T_2=-125.58\°C$

Explanation:

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In this case, considering the Gay-Lussac's law which describes the pressure-temperature behavior as a directly proportional relationship by holding the volume as constant, we write:

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$T_2=\frac{T_1P_2}{P_1}$

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$T_2=\frac{(22+273.15)K*1.75atm}{3.50atm} \\\\T_2=147.58K-273.15\\\\T_2=-125.58\°C$

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2 years ago

A 32.5 g iron rod, initially at 22.4 ∘C, is submerged into an unknown mass of water at 63.0 ∘C, in an insulated container. The f

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$m_{H_2O}=39.0g$

Explanation:

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In this case, is possible to infer that the thermal equilibrium is governed by the following relationship:

$\Delta H_{iron}=-\Delta H_{H_2O}\\m_{iron}Cp_{iron}(T_{eq}-T_{iron})=-m_{H_2O}Cp_{H_2O}(T_{eq}-T_{H_2O})$

Thus, both iron's and water's heat capacities are: 0.444 and 4.18 J/g°C respectively, so one solves for the mass of water as shown below:

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3 years ago

How many total electrons can be contained in the 4d sublevel? 2 6 10 14

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3 years ago

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