Which event best helped Becquerel determine uranium radiates rays?

2 K + Cl2 → 2 KCI How many grams of KCI (74.55 g/mol) is produced from 2.50 mol of K?

Rudik [331]

Answer: 186.3 g of $KCl$ will be produced from 2.50 mol of K

Explanation:

The balanced chemical reaction is:

$2K+Cl_2\rightarrow 2KCl$

According to stoichiometry :

2 moles of K produce = 2 moles of $KCl$

Thus 2.50 moles of $K$ will produce= $\frac{2}{2}\times 2.50=2.50moles$ of $KCl$

Mass of $KCl=moles\times {\text {Molar mass}}=2.50moles\times 74.55g/mol=186.3g$

Thus 186.3 g of $KCl$ will be produced from 2.50 mol of K

8 0

3 years ago

Which of the four containers represents a compound? A) Cl B) H2O C) N2 D) Na

MissTica

B)H20 Hydrogen+oxygen=H2O
(Water) you should know this

6 0

3 years ago

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A mixture of 0.10 mol of NO, 0.050 mol of H2, and 0.10 mol of H2O is placed in a 1.0- L vessel at 300 K . The following equilibr

umka2103 [35]

Answer:

The concentration of N2 at the equilibrium will be 0.019 M

Explanation:

Step 1: Data given

Number of moles of NO = 0.10 mol

Number of moles of H2 = 0.050 mol

Number of moles of H2O = 0.10 mol

Volume = 1.0 L

Temperature = 300K

At equilibrium [NO]=0.062M

Step 2: The balanced equation

2NO(g) + 2H2(g) → N2(g) + 2H2O(g)

Step 3: Calculate the initial concentration

Concentration = Moles / volume

[NO] = 0.10 mol / 1L = 0.10 M

[H2] = 0.050 mol / 1L = 0.050 M

[H2O] = 0.10 mol / 1L = 0.10 M

[N2] = 0 M

Step 4: Calculate the concentration at the equilibrium

[NO] at the equilibrium is 0.062 M

This means there reacted 0.038 mol (0.038M) of NO

For 2 moles NO we need 2 moles of H2 to produce 1 mol N2 and 2 moles of H2O

This means there will also react 0.038 mol of H2

The concentration at the equilibrium is 0.050 - 0.038 = 0.012 M

There will be porduced 0.038 moles of H2O, this means the final concentration pf H2O at the equilibrium is 0.100 + 0.038 = 0.138 M

There will be produced 0.038/2 = 0.019 moles of N2

The concentration of N2 at the equilibrium will be 0.019 M

5 0

4 years ago

In the human ear, sound waves are gathered in the ________.

-Dominant- [34]

Sound wave is gathered by Pinna ; which is outer ear !!

So C is your answer !!

8 0

3 years ago

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What is a disadvantage of using a structural model to show a chemical compound? Structural models provide minimal three-dimensio

aksik [14]

The answer is the first: that structural models provide minimal three-dimensional information. This is because the ball-and-stick model cannot show the actual size of the atoms depicted in the model. You also cannot see the actual bond lengths between the atoms. This, then, limits the accuracy of the model and fails to precisely portray how the chemical compounds being shown are like in all actuality. Thus, though you do see a three-dimensional picture of the chemical compound, this picture is not completely accurate and is not scaled to size.

6 0

4 years ago

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