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3 years ago

3. Where are gastropods found? Choose all the correct answers.

Chemistry

2 answers:

Agata [3.3K]3 years ago

8 0

Answer:

Explanation:

they live in every habitat on Earth. Marine habitats, ocean basins, freshwater habitats, and inland equatic habitats including salt lakes.

dalvyx [7]3 years ago

4 0

D.

Gastropods live in every conceivable habitat

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Which of the following statements is true?

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Both liquids and gases are fluids = true

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solution contains 174 grams of lithium bromide in 360 grams of water, what is the mole fraction of lithium bromide

Luba_88 [7]

Answer:

$\large\boxed{\large\boxed{0.091}}$

Explanation:

The mole fraction of a component in a mixture is the number of moles of the component divided by the total number of moles of all the components, multiplied by 100.

The symbol X is used to represent the mole fraction.

$X_A=\dfrac{\text{number of moles of component A}}{\text{number of moles of all the components}}\times 100$

1. Convert masses in grams to number of moles

Formula:

number of moles = mass in grams / molar mass

a) Lithium bromide

Chemical Formula: LiBr
Molar mass: 86.845 g/mol

$\text{Number of moles}=\dfrac{174g}{86.845g/mol}=2.00mol$

b) Water

Chemical formula: H₂O

Molar mass: 18.015 g/mol

$\text{Number of moles}=\dfrac{360g}{18.015g/mol}=19.98mol\approx 20.0mol$

c) Total number of moles = 2.00 mol + 20.0 mol = 22.0 mol

2. Mole fraction of lithium bromide

$\text{Mole fraction of lithium bromide}=\dfrac{2.00}{22.0}=0.091$

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3 years ago

Perrhenic acid reacts with potassium hydroxide. Complete the word equation for this reaction. perrhenic acid + potassium hydroxi

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You need to prepare 250.0 mL of a 1.35 M HCl solution from a 4.50 M HCl stock solution. Glassware A is a 250 m L beaker. Glasswa

ch4aika [34]

Answer: Glassware C

Explanation:

According to moalrity equation:

$M_1V_1=M_2V_2$

$M_1$ = Molarity of stock solution = 4.50 M

$V_1$ = volume of stock solution = ?

$M_2$ = molaity of diluted solution = 1.35 M

$V_2$ = volume of diluted solution = 250.0 ml

$4.50\times V_1=1.35\times 250.0$

$V_1=75.0ml$

A volumetric flask is more accurate for making solutions than a beaker or erlenmeyer flask and hence to measure 75.0 ml of stock solution , we use 250 ml of volumetric flask.

Thus 75.0 ml of stock is pipetted out using pipette and put into a volumetric flask of 250 ml and water is added till the mark reaches 250 ml.

A volumetric flask is more accurate for making solutions than a beaker or erlenmeyer flask and hence to measure 75.0 ml of stock solution , we use 250 ml of volumetric flask.

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