2 years ago

Grtdggddgdggrsggrgrgd

Chemistry

1 answer:

n200080 [17]2 years ago

7 0

Answer:

wut??

Explanation:

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How many atoms are in 85.1 grams of neon

strojnjashka [21]

Convert the mass to moles .

85.1 g ÷ 20.18 g/mol = 4.21704658

convert the moles to molecules

4.2170 mol × 6.022^23 molecules/mol = 2.539^24

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3 years ago

How would you balance this equation<br><br> HCL+ Ba > BaCL2 + H2

vladimir2022 [97]

<span>2 HCl + Ba(OH)2 = BaCl2 + 2 H2O is the answer.</span>

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3 years ago

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The change in enthalpy that occurs in the process of converting reactants to products in a chemical reaction is called the _____

zheka24 [161]

Answer:

∆H or Enthalpy of the reaction

Explanation:

If ∆H is +ve

Reaction is exothermic
Example:-Combustion, mixing sodium/potassium in water

If ∆H is -ve

Reaction is endothermic
Ex:-Melting of ice

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2 years ago

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A student plans to use a density versus solution concentration standard curve to identify the sodium chloride concentration in a

Art [367]

Answer:

a. 0.50 g, 1.0 g, 1.5 g, 2.0 g, 2.5 g;

g. 0.1 g, 0.5 g, 1.0 g, 1.5 g, 2.0 g

Explanation:

The percent mass is defined as a ratio between the mass of a solute and mass of a solution:

$\omega = \frac{m_{solute}}{m_{solution}}\cdot 100\%$

Since solution only consists of a solute and solvent, express its mass as:

$m_{solution} = m_{solute} + m_{solvent}$

Then:

$\omega = \frac{m_{solute}}{m_{solution}}\cdot 100\%=\frac{m_{solute}}{m_{solute} + m_{solvent}}$

Firstly, solve for how much mass is required to prepare 3.0 %. Let's say, we have x g of the solute:

$0.03 = \frac{x}{30.0 + x}\therefore x = 0.03(30.0 + x)$

$x = 0.90 + 0.03x$

$0.97x = 0.90\therefore x = 0.93 g$

Similarly, solve for 6.0 %, let's say, we have x g of the solute again:

$0.06 = \frac{x}{30.0 + x}\therefore x = 0.06(30.0 + x)$

$x = 1.80 + 0.06x$

$0.94x = 1.80\therefore x = 1.91 g$

Hence, masses should be in a range of 0.93 g to 1.91 g.

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3 years ago

If you have significant concerns about a child's development, you should A. sensitively present your concerns to the family and

Veronika [31]

I think its answer choice A because it would better to talk to their parents first and not take matters into your own hands.

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2 years ago

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