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3 years ago

HELPPP PLEASEEE!!! calculate the energy of radiation with a wavelength of 432 nm

1 answer:

4 0

Formula:

f = C/λ

Where,

λ (Lambda) = Wavelength in meters

c = Speed of Light (299,792,458 m/s)

f = Frequency (MHz)

answer= 693964023.148148 MHz

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sodium reacts with chlorine gas to form sodium chloride. if you have 60 L of chlorine gas at STP and 30 g of sodium, how many gr

Stels [109]

Answer:

75.9 grams of salt

Explanation:

The reaction is the following:

2Na(s) + Cl₂(g) → 2NaCl(s) (1)

We have:

m(Na): the mass of sodium = 30 g

V(Cl₂): the volume of the chlorine gas at STP = 60 L

So, to find the mass of NaCl we need to calculate the number of moles of Na and Cl₂.

$n_{Na} = \frac{m}{A_{r}} = \frac{30 g}{22.99 g/mol} = 1.30 moles$

The number of moles of Cl₂ can be found by the Ideal gas law equation:

$PV = n_{Cl_{2}}RT$

Where:

P: is the pressure = 1 atm (at STP)

R: is the gas constant = 0.082 L*atm/(K*mol)

T: is the temperature = 273 K (at STP)

$n_{Cl_{2}} = \frac{PV}{RT} = \frac{1 atm*60 L}{0.082 L*atm/(K*mol)*273 K} = 2.68 moles$

Now we need to find the limiting reactant. From the stoichiometric relation between Na and Cl₂ (equation 1), we have that 2 moles of Na react with 1 mol of Cl₂, so:

$n_{Na} = \frac{2 moles Na}{1 mol Cl_{2}}*2.68 moles Cl_{2} = 5.36 moles$

Since we have 1.30 moles of Na, the limiting reactant is Na.

Finally, we can find the number of moles of NaCl and its mass.

$n_{NaCl} = n_{Na} = 1.30 moles$

$m_{NaCl} = n_{NaCl}*M = 1.30 moles*58.44 g/mol = 75.9 g$

Therefore, would be formed 75.9 grams of salt.

I hope it helps you!

3 0

3 years ago

Classify each phrase according to whether it applies to photophosphorylation, oxidative phosphorylation, or both

chubhunter [2.5K]

Answer:

1. Both

2. Phosphorylation

3. Both

4. Phosphorylation

5. Oxidative.

6. Both

Explanation:

Phosphorylation only occurs in chloroplast and it involves larger electrical component. Both Phosphorylation and oxidative occurs in mitochondria and it involves proton gradient. They occur in plants to produce ATP. Oxidative involves in smaller electrical component.

6 0

3 years ago

Help with this chemistry question please???

givi [52]

To find percent composition, you should first find the total of all of the components. Just add them all together:

$100g+200g+50g=350g$

Then, divide the amount of the component you are interested in, in this case, chocolate (50g), by the total amount to give:

$\frac{50g}{350g}$

This will give you the answer in decimal form, but to convert to a percent, you need to multiply by 100:

$\frac{50g}{350g}*100$

Therefore, the answer choice that is correct is A.

6 0

3 years ago

Metal or Non-metal?

goldenfox [79]

Answer:

Fluorine:non-metal

Bromine:non-metal

Hydrogen:non-metal

Beryllium:metal

Nitrogen:non-metal

5 0

3 years ago

When a sound source approaches you, the pitch you hear is

IgorC [24]

Higher <span>C. higher than when the source is stationary</span>

7 0

3 years ago