Answer:
none of the above is the answer
Answer:
The correct option is;
D. (2)(56 g)
Explanation:
MgCl₂ + 2KOH → Mg(OH)₂ + 2KCl
From the balanced chemical reaction equation, we have;
One mole of MgCl₂ reacts with two moles of KOH to produce one mole of Mg(OH)₂ and 2 moles of KCl
Therefore, the number of moles of KOH that react with one mole of KCl = 2 moles
The mass, m, of the two moles of KOH = Number of moles of KOH × Molar mass of KOH
The molar mass of KOH = 56.1056 g/mol
∴ The mass, m, of the two moles of KOH = 2 moles × 56.1056 g/mol = 112.2112 grams
The amount in grams of KOH that react with one mole of MgCl₂ = 112.2112 grams ≈ 112 grams = (2)(56 g).
Answer:

Explanation:
The frequency and the wavelength of a wave are related by the equation

where
v is the speed
f is the frequency
is the wavelength
For the sound wave in this problem, we have
f = 634 Hz (frequency)
(wavelength)
Therefore, the speed of the wave is

The speed of sound in air depends on the temperature according to the equation

where T is the temperature.
In this problem, we know the speed, so we can calculate the temperature:
Answer:
200 °C
Explanation:
Let’s convert all the temperatures to the same scale, say, Celsius.
<em>Celsius</em>
Water boils at 100 °C, so 200 °C is the temperature of <em>superheated steam</em>.
<em>Fahrenheit
</em>
Water boils at 212 °F, so 200 °F is <em>just below the boiling point of water</em>.


<em>Kelvin
</em>
Standard temperature is 0 °C = 273.15 K. Ice melts at 273.15 K (0 °C), so
200 K is <em>well below the melting point of ice</em>.
C = K – 273.15
C = 200 -273.15 = -73 °C
Thus, 200 °C is the hottest temperature.