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MAXImum [283]
4 years ago
9

How many moles are in 55.0 g calcium nitrate?

Chemistry
1 answer:
Alex17521 [72]4 years ago
5 0

Answer: 0.335 mols Ca(NO3)2

Explanation: To go from grams to mols you divide grams by the molar mass of the substance so, 55/164.088 = 0.335

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Which of the following is a statement that describes a problem that can be solved using technology design?
Illusion [34]

Answer:

the smoke one

Explanation:

it can be made aware of and people can raise money to stop it/ help it

4 0
2 years ago
Which of the following is not a concentration unit (a) 1 molar (b) 1 equivalent (c) 1% by mass (d) 1 molal
musickatia [10]

Answer:

(b) 1 equivalent  

Step-by-step explanation:

Concentration is the relative amount of a substance in a given volume or mass of something else.

An equivalent is not a concentration, because it is just a mass —the mass of a substance needed to react with or supply one gram of hydrogen.

(a) is <em>wrong</em>. 1 M means that there is 1 mol of a substance in 1 L of solution.

(c) is <em>wrong</em>. 1 % by mass that there is 1 g of a substance in 100 g of the mixture.

(d) is <em>wrong</em>. 1 m means that there is 1 mol of a substance in 1 kg of solvent.

6 0
4 years ago
What instrument, along with a telescope, allows study of the wavelengths of visible light coming from a star?
LenKa [72]
The answer is D. a spectrograph
4 0
4 years ago
Read 2 more answers
What is tetanus? What are the symptoms and consequences of the disease? Who is at risk of developing tetanus? How do vaccines wo
Arada [10]

Answer:

The tetanus vaccine is a dose of the bacterium Clostridium Tetani, in inactive form or even a surface molecule that helps the body to actively form the antibody.

The tetanus vaccine has coverage for life, it is mandatory in those countries where the disease became common, such as the USA, Argentina, Chile, Uruguay among others.

Before a surgical act or a suspicion of exposure with this bacterium, the booster of the tetanus vaccine should be administered quickly.

Explanation:

Tetanus disease generates a tetanization of all the muscles of the organism, generating spasmodic contractions, which make it impossible to function and develop life when it affects the diaphragm as it makes breathing impossible.

Tetanization does not affect differently in age or sex, it only consists of contamination with the bacteria to be sufficient.

The sources of contagion are areas of mud or earth, rusty cutting or sharp elements, and poorly hygienic or abandoned areas. In order for the bacteria to be transmitted or the transmission route to be fulfilled, there must be a lesion of loss of continuity of the epithelium or mucosa.

6 0
3 years ago
How many lone pairs of electrons are represented in the Lewis structure of a phosphate ion (PO43-)?
skad [1K]
Hey

P has 5 valence electrons
O has 6 valence electrons (each for 4 oxygen)
And finally, for every negative charge, there is an additional valence electron

We should add these all up = 5 + 24 + 3 = 32 valence electrons

With this, we can be guided to illustrate the lewis structure as P as central atom and the 3 oxygen each with a single bond with P and 1 oxygen with a double bond with P. We place the valence electrons until octet rule is satisfied,
we will be left with 12 lone pairs for phosphate ion.

Hoped I Helped
6 0
4 years ago
Read 2 more answers
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