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3 years ago

Determine the number of moles of 35.4 grams of Magnesium.

Chemistry

1 answer:

dezoksy [38]3 years ago

5 0

Answer:

1.46 moles

Explanation:

You need to multiply 35.4g by Magnesium's molar mass.

Molar mass =1 mole/24.305g

(35.4g)(1 mole Mg/24.305g)= 1.46 moles <- rounded to 3 significant figures

As you can see, grams cancel out and you're left with moles.

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What is the energy in joules of one photon of microwaveradiation with a wavelength 0.122m?

pentagon [3]

Answer: The energy of photon is $162.93\times 10^{-26}J$

Explanation:

The relation between energy and wavelength of light is given by Planck's equation, which is:

$E=\frac{hc}{\lambda}$

where,

E = energy of the light = ?

h = Planck's constant = $6.626\times 10^{-34}Js$

c = speed of light = $3\times 10^8m/s$

$\lambda$ = wavelength of photon = 0.122 m

Putting values in above equation, we get:

$E=\frac{(6.626\times 10^{-34}Js)\times (3\times 10^8m/s)}{0.122m}\\\\E=162.93\times 10^{-26}J$

Hence, the energy of photon is $162.93\times 10^{-26}J$

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3 years ago

At room temperature (208C) and pressure, the density of air is 1.189 g/L. An object will float in air if its density is less tha

Ugo [173]

Total density of filled ball with nitrogen gas: $\frac{0.12G+0.6524g}{0.560L} = 1.3792g/L$

The relationship between mass and volume can be easily determined using density; for example, the mass of a body is equal to its volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d). The ball filled with nitrogen will not float in the air because total density of filled ball is greater than the density of an air. Density of the evacuated ball D = 0.214 g/L

Density of nitrogen gas = $d_4=1.165g/L$

Mass of the nitrogen gas : $1.165g/L \times 0.560L = 0.6524g$

Learn more about Mass and Density here:

brainly.com/question/10821730

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1 year ago

A PNP transistor is connected in a circuit so that the collector-base junction remains reverse biased and the emitter-base junct

maw [93]

Here are the choices:

A. the output current will be much smaller than the input current.
B. the output voltage will be much larger than the input voltage. 
C. the output voltage will be much smaller than the input voltage. 
D. the output current will be much larger than the input current

The correct answer is letter B. the output voltage will be much larger than the input voltage.

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3 years ago

How many milliliters of juice are in this graduated cylinder?

Vanyuwa [196]

16 I think but I could be wrong lol

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3 years ago

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Which is the electron configuration for bromine? 1s22s22p63s23p64s23d104p5 1s22s22p63s23p64s23d104p6 1s22s22p63s23p44s23d104p5 1

Svetach [21]

Answer : The correct option is, $1s^22s^22p^63s^23p^64s^23d^{10}4p^5$