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Andrews [41]
4 years ago
11

Why is a solution not a pure substance?

Chemistry
1 answer:
adelina 88 [10]4 years ago
4 0
Because a solution is two substances mixed together, such as water and salt. A pure substance is that substance and only that substance, such as purified water with no chemicals added. But when you mix salt in it, it become unpure.
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A sample of gas contains 0.1900 mol of CO(g) and 0.1900 mol of NO(g) and occupies a volume of 22.0 L. The following reaction tak
worty [1.4K]

Answer:

V₂ = 16.5 L

Explanation:

To solve this problem we use <em>Avogadro's law, </em>which applies when temperature and pressure remain constant:

V₁/n₁ = V₂/n₂

In this case, V₁ is 22.0 L, n₁ is [mol CO + mol NO], V₂ is our unknown, and n₂ is [mol CO₂ + mol N₂].

  • n₁ = mol CO + mol NO = 0.1900 + 0.1900 = 0.3800 mol

<em>We use the reaction to calculate n₂</em>:

2CO(g) + 2NO(g) → 2CO₂(g) + N₂(g)

  • mol CO₂:

0.1900 mol CO * \frac{2molCO_{2}}{2molCO} = 0.1900 mol CO₂

  • mol N₂:

0.1900 mol NO * \frac{1molN_{2}}{2molNO} = 0.095 mol N₂

  • n₂ = mol CO₂ + mol N₂ = 0.1900 + 0.095 = 0.2850 mol

Calculating V₂:

22.0 L / 0.3800 mol = V₂ / 0.2850 mol

V₂ = 16.5 L

3 0
4 years ago
A chemist has one solution that is 25% salt and 75% water and another solution that is only 5% salt. how many milliliters of eac
Arte-miy333 [17]
The formula that we will be using is:

total salt / total solution = .10
Let a be the ml of the first solution

And let b be the ml of the second solution
.25a + .05b / a + b = .10
Also:

a + b = 1400

a = 1400 - b
So substitute:
.25 x (1400 - b) + .05b / 1400 = .10

350 - .25b + 0.05b/ 1400 = .10

350 - .2b / 1400 = .10
350 - .2b = .10 x 1400

.2b = 350 - 140

.2b = 210

b = 1050

a = 1400 - b

a = 1400 - 1050

= 350 mL
3 0
3 years ago
For the following reaction, if 19.7 g of H2, is reacted with excess CO in the laboratory, and 144.5 g of CH3OH is produced, what
GuDViN [60]

Step 1

<em>The reaction involved:</em>

CO + 2 H2 → CH3OH (completed and balanced)

------------

Step 2

<em>Data provided:</em>

19.7 g H2 (the limiting reactant)

Excess reactant = CO

144.5 g CH3OH = actual yield

----

<em>Data needed:</em>

The molar masses of:

H2) 2.00 g/mol

CH3OH) 32.0 g/mol

-----------

Step 3

The theoretical yield:

By stoichiometry,

CO + 2 H2 → CH3OH (The molar rate between H2 and CH3OH = 2:1)

2 x 2.00 g H2 --------- 32.0 g CH3OH

19.7 g H2 --------- X

X = 19.7 g H2 x 32.0 g CH3OH/2 x 2.00 g H2

X = 157.6 g CH3OH (The theoretical yield)

-----------

Step 4

The % yield is defined as follows:

\begin{gathered} \text{ \%yield = }\frac{Actual\text{ yield}}{Theoretical\text{ yield}}x100\text{ } \\ \text{ \%yield = }\frac{144.5\text{ g}}{157.6\text{ g}}x100\text{ = 91.7 \% = 92 \% approx.} \end{gathered}

Answer: d. 93% (it is the nearest value in comparison to my result)

6 0
2 years ago
Which of the following would form a nonelectrolyte solution in water? A. KCl B. NaNO3 C. C6H12O6 D. Cu2SO4
ss7ja [257]
<span>C. C6H12O6

</span>This compound is covalent, and all salts are ionic compounds.
3 0
4 years ago
Read 2 more answers
Which material property is most directly related to the x-axis value at the x-intercept of the interatomic force versus distance
Brrunno [24]

Answer:

Explanation:

The mechanical properties of a material affect how it behaves as it is loaded. The elastic modulus of the material affects how much it deflects under a load, and the strength of the material determines the stresses that it can withstand before it fails

3 0
2 years ago
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