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3 years ago

What statement about halogens is true?

Chemistry

2 answers:

Leya [2.2K]3 years ago

8 0

D) I am 80% sure..........

likoan [24]3 years ago

7 0

The answer is actually A because a halogen is a non metal and exists as a single atom

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How many moles of a solute is present in 4.00L of an 8.30M solution

Sladkaya [172]

Answer:

The number of moles of solute present in 4.00 L of an 8.30 M solution is 33.2

Explanation:

The Molarity (M) or Molar Concentration is the number of moles of solute per liter of solution; in other words it is the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

$Molarity=\frac{number of moles of solute}{volume}$

Molarity is expressed in units ( $\frac{moles}{liter}$ ) or M.

In this case:

molarity= 8.30 M
number of moles of solute= ?
volume= 4.00 L

Replacing:

$8.30 M=\frac{number of moles of solute}{4 L}$

Solving:

number of moles of solute= 8.30 M* 4 L= 8.30 $\frac{moles}{liter}$ * 4 L

number of moles of solute =33.2

<u><em>The number of moles of solute present in 4.00 L of an 8.30 M solution is 33.2</em></u>

6 0

3 years ago

how many moles of iodine should be added to 750 grams of carbon tetrachloride to prepare a 0.24 m solution

aleksley [76]

Answer:

0.18 mol

Explanation:

Given data

Mass of carbon tetrachloride (solvent): 750 g

Molality of the solution: 0.24 m

Moles of iodine (solute): ?

Step 1: Convert the mass of the solvent to kilograms

We will use the relationship 1 kg = 1,000 g.

$750g \times \frac{1kg}{1,000g} =0.750kg$

Step 2: Calculate the moles of the solute

The molality is equal to the moles of solute divided by the kilograms of solvent. Then,

$m = \frac{moles\ of\ solute }{kilograms\ of\ solvent} \\moles\ of\ solute = m \times kilograms\ of\ solvent = \frac{0.24mol}{kg} \times 0.750kg = 0.18 mol$

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3 years ago

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Baking soda and vinegar lab demo part 2 mass! 7th grade please help!

Schach [20]

Answer:

just watch the video, what does it start with, write that down for each trial, then what does it end with, then starting mass - ending mass is the change mass

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3 years ago

Hydrangea plant's petals change to which colour on the addition of acids?

Black_prince [1.1K]

If it's a pH below six it's blue, if it's a pH between 6 and 7 then it would be purple, if it's above 7 it would be pink or red

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4 years ago

Which of the following is the balanced form of the equation CH4 + O2 → CO2 + H2O?

lianna [129]

B) CH4 + 2O2=>CO2 + 2H2O

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3 years ago

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