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2 years ago

What mass of sodium bicarbonate do you start with

Chemistry

1 answer:

valentina_108 [34]2 years ago

5 0

Answer:

84.007 g/mol

Explanation:

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Student uses a magnet to move 0.0 25 KG metal box the magnet exerts a force of 5N which causes the ball to begin moving what is

daser333 [38]

Answer: 200 m/s2

Explanation:

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2 years ago

How many moles of Na3PO4 are in 820. grams of it?

kotegsom [21]

Answer:Hello

D is correct

Explanation:

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2 years ago

How do I find the number of electrons in an Isotope? For example, I know that in the image attached the isotope has 45 protons a

vova2212 [387]

Answer:

The answer to your question is: 45 electrons

Explanation:

Isotopes are molecules that have the same number of protons but the number of neutrons is different.

Also, in a neutral atom, the number of protons and electrons is the same.

In the example given, we can see that the atom is neutral so, the number of protons = 45 and the number of electrons = 45.

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2 years ago

El átomo de bromo tiene Z=35 la configuración electrónica por niveles y subniveles de energía

Mrrafil [7]

Z=35

The element is bromine
Sign(Br)

Electronic configuration:-

$\\ \sf\longmapsto 1s^22s^22p^63s^23p^64s^23d^104p^5$

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2 years ago

Working on-board a research vessel somewhere at sea, you have (carefully) isolated 12.5 micrograms (12.5 ×10–6 g) of what you ho

german

Answer:

The value is $Z = 311.33 \ g/mol$

Explanation:

From the question we are told that

The mass of saxitoxin is $m = 12.5 mg = 12.5 * 10^{-6} g$

The volume of water is $V = 3.10 mL = 3.10 *10^{-3} L$

The osmotic pressure is $P = 0.236 = \frac{0.236}{760} = 3.105 * 10^{-4} atm$

The temperature is $T = 19^oC = 19 + 273 = 292 \ K$

Generally the osmotic pressure is mathematically represented as

$P = C * T * R$

Here R is the gas constant with value

$R = 0.0821 ( L .atm /mol. K)$

and C is the concentration of saxitoxin

$3.105 * 10^{-4} = C * 0.0821 * 292$

$C = 1.295 *10^{-5} mol/L$

Generally the number of moles of saxitoxin is mathematically represented as

$n = C * V$

=> $n = 1.295 *10^{-5} *3.10 *10^{-3}$

=> $n = 4.015 *10^{-8} \ mol$

Generally the molar mass of saxitoxin is mathematically represented as

$Z = \frac{m}{n}$

=> $Z = \frac{12.5 * 10^{-6}}{ 4.015 *10^{-8}}$

=> $Z = 311.33 \ g/mol$

5 0

3 years ago