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Anna35 [415]
3 years ago
9

Please help, I'll give brainiest!

Chemistry
1 answer:
Whitepunk [10]3 years ago
8 0

is it a word problem beacuse i cant see the image. Im really good a chem but if you can write the question in the commets il answer it in the comments

Explanation:

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Calculate the number of moles in 7g of nitrogen gas​
Andru [333]

Answer:

<h3>0.2498molN_{2}</h3>

Explanation:

7gN2 x \frac{1 mol}{2(14.01) g}

=0.2498mol N2

Nitrogen gas has the formula N_{2} so therefore that means you would have to multiply the mass in the molar by 2. To solve for the number of moles you need to cancel out the grams, you do this by using the molar mass of nitrgoen gas. You get the value on in the denominator from the periodic table (atomic mass of element). The grams will cancel out, leaving you with the number of moles when you divide 7/2(14.01).

5 0
3 years ago
How many grams of lithium sulfide must be dissolved in 1600.0 g water to make a 2.0 molal solution?
klasskru [66]
Molality is the number of moles of solutes in 1 kg of solvent.
the molality of solution to be prepared is 2.0 molal. 
therefore 2 moles in 1 kg water.
the mass of Li₂S required is - 46 g/mol x 2.0 mol = 92 g
the mass in 1 kg of solvent is - 92 g
Therefore mass of Li₂S required in 1600.0 g is - 92 g/kg x 1.6 kg = 147.2 g
7 0
3 years ago
Which of the following is the best example of a physical system?
Natasha2012 [34]
A) a city would be bet
4 0
3 years ago
By paying low wages, factory owners were able to
sweet [91]
To make more profit and make their business/company’s lager this also means that the customers that buy products have more variety of choices
5 0
4 years ago
Enter the chemical formula of a binary molecular compound of hydrogen and a Group 6A element that can reasonably be expected to
Ber [7]

Answer:

H₂Se

Explanation:

A way of estimating the acidity of a weak acid is by analizing the<em> stability of the formed anion</em>. In this case, we should find a Group 6A element that in its anionic forms (HX⁻ and X⁻²) is more stable than HS⁻ and S⁻², thus it would be more acidic in aqueous solution.

The anionic forms of Se are more stable than the forms of S, similarly to how Br⁻ is more stable than Cl⁻.

8 0
3 years ago
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