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nordsb [41]
2 years ago
14

Help please this is also science idk why brainly doesn't have that option

Chemistry
2 answers:
solniwko [45]2 years ago
6 0

Answer:

fffffffffffdddddddddddddddddd

Explanation:

fdddddddddddddddddddddddddd

NNADVOKAT [17]2 years ago
3 0
The answer is A !!!!
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Please help i dont understand it
Setler [38]

Answer:-  solution boiling point = 102.23 degree C (102 degree C with three sig figs).

Solution:- When a non volatile solute is added to a solvent then boiling point increases. Elevation in boiling point is directly proportional to the molality of the solution.

The equation is:

\Delta T_b=i*k_b*m

where, \Delta T_b is the elevation in boiling point, i is the Van't hoff factor, k_b is the molal elevation constant and m is the molality.

Value of i is 1 as ethylene glycol is a covalent molecule that does not break to give ions. k_b for water is \frac{0.512^0C}{m} .

We can calculate the molality from the given grams of ethylene glycol and liters of water as molality is moles of solute per kg of solvent.

Molar mass of ethylene glycol is 62 gram per mol and density of water is 1.00 kg per liter.

2.50L(\frac{1kg}{1L})

= 2.50 kg

Let's calculate the moles of ethylene glycol.

675g(\frac{1mol}{62g})

= 10.9 mol

molality of the solution = \frac{10.9mol}{2.50kg}

= 4.36m

Let's plug in the values in the equation we have on the top for elevation in boiling point.

\Delta T_b=4.36m(\frac{0.512^0C}{m})

= 2.23^0C

Boiling point of pure water is 100 degree C. So, the boiling point of the solution = 100 + 2.23 = 102.23 degree C

(If we fix the three sig figs then it could be written as 102 degree C.)

4 0
3 years ago
Read 2 more answers
Naturally occurring boron has an atomic weight of 10.811. Its principal isotopes are 10B and 11B. Part A What is the abundance (
Darya [45]

Answer:

10B has 18.9%

11B has 81.1%

Explanation:Please see attachment for explanation

4 0
3 years ago
You work for a cutlery manufacturer who wants to electrolytically precipitate 0.500 g of silver onto each piece of a batch of 25
ICE Princess25 [194]

Answer:

373.1 mL of AgCN (aq) must be poured into your electrolysis vat to ensure you have sufficient Ag to plate all of the forks.

Explanation:

Mass of silver to be precipitated on ecah spoon = 0.500 g

Number of silver spoons = 250

Total mass of silver = 250 × 0.500 g = 125 g

Moles (n)=Molarity(M)\times Volume (L)

Moles of AgCN = n  = \frac{125 g}{134 g/mol}=0.9328 mol

Volume of AgCN solution =V

Molarity of the AgCN = 2.50 M

V=\frac{0.9328 mol}{2.50 M}=0.3731 L=373.1 mL

(1 L = 1000 mL)

373.1 mL of AgCN (aq) must be poured into your electrolysis vat to ensure you have sufficient Ag to plate all of the forks.

6 0
3 years ago
Express the following quantity in scientific notation. The answer needs to have the correct number of significant figures. 21,30
melisa1 [442]
2.13 x 10 E 7 i believe this is correct
4 0
3 years ago
Read 2 more answers
Why our body is not crushed due to atmostsparic pressure​
kirill [66]
Fluid and air flows around you and tries to crush you in but Fortunately, there is typically just as much pressure inside your body pressing outward as there is air pressure outside your body pushing inward. They typically cancel out, meaning that there is no overall force on you and you don't get crushed.
7 0
3 years ago
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