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mote1985 [20]
3 years ago
14

Choose the correct coefficients for the equation? ____NaCI>____Na+___C12​

Chemistry
1 answer:
Wewaii [24]3 years ago
6 0

Explanation:

Ca + NaCl ----> CaCl2 + Na

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How many neutrons make up one of these potassium atoms?
Doss [256]
Potassium has twenty neutrons
6 0
3 years ago
Read 2 more answers
What is the mass of 2.50 × 1025 molecules of sugar (c12h22o11)?
allochka39001 [22]
To determine the mass of the sugar molecules given, we  need to convert the given value into moles by using the a constant. <span>Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. Then, by using the molar mass of sugar, we can convert from moles to grams. Molar mass of sugar is 342.3 g/mol. We do as follows:

</span><span>2.50 × 10^25 molecules of sugar ( 1 mol / 6.022x10^23 g ) ( 342.3 g / 1 mol) = 14210.40 grams of sugar present</span>

3 0
4 years ago
1. To measure the pressure of an isolated gas you would use a barometer or a manometer?
Ronch [10]

Answer:

deeznutz

Explanation: 9+10

3 0
3 years ago
When an excited electron in a hydrogen atom falls from ????=5 to ????=2, a photon of blue light is emitted. If an excited electr
poizon [28]

Answer:

n = 3

Explanation:

Given the formula for the transition energy of an atom with 1 electron:

E=-13.6*Z^{2}*(\frac{1}{n_{f}^{2}}-\frac{1}{n_{i}^{2}} ) eV

For the H transition n=5 to n=2:

E=-13.6*(\frac{1}{4}-\frac{1}{25} ) eV=-2.856 eV

Then we solve for nf with Z=2 (Helium)

n_{f}=\sqrt{\frac{n_{i}^{2}*Z^{2}*13.6 eV }{2.856eV*n_{i}^{2}+13.6eV*Z^{2}} }

n_{f}=\sqrt{\frac{4^{2}*2^{2}*13.6 eV }{2.856eV*4^{2}+13.6eV*2^{2}} }=3

Is near 3, actually the energy of the transitions are:

H (5⇒2) = -2.85 eV = 434 nm (Dark blue)

He (4⇒3) = -2.64 eV = 469 nm (Light blue)

I thought it was cool to see the actual colors. Included them.

4 0
3 years ago
Need help with these.
kakasveta [241]
I got you bro by the power of my heart and the felling of agony my condolences go to the Siskin of Thebes
5 0
3 years ago
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