How many moles of ethyl alcohol, C2H6O, are in a 18.0 g sample?

Answers

Answer 1

Answer: To find moles in this sample, you would divide grams by molar mass of ethyl alcohol
(18.0g)/(46.07g/mol) = 0.391mol C2H6O

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What is migrate? Help me pls

Answers

means moving from one place to the other

Hey there

Migrate means moving from habitat to another. Example - I migrated to Canada in 1994. Another example is - when autumn arrives, birds migrate south.

The empirical formula of styrene is CH; its molar mass is 104.1 g/mol. What is the molecular formula of styrene?A) C2H4
B) C8H8
C) C10H12
D) C6H6
E) none of these

i got C8H8 because i did
MWEF=n

but it says the answer should be C2H4

how is that possible?

Answers

You got the answer correct. If you would double check
given:C (12 g/mol) H (1 g/mol).

12(8) + 1(8) = 104 g/mol

and for C2H4
12(2)+1(4) = 28g/mol

Also, chemical formula of styrene is C6H5CH=CH2.

1. Find the molecular formula of styrene

Molecular formula = n x empirical formula

n= 104.14/13.02 = 8 where 13.02 is the empirical mass of CH

Molecular formula = CH x 8
= C8H8

2. From step 1, one molecule of styrene contains 8 atoms of hydrogen or one mole of styrene molecules contains 8 moles of hydrogen atoms (remember the formula of styrene is C8H8).

3. Convert 3.49 g styrene to mole styrene

mole styrene = 3.49 g/104.14 g/mol = 4.71 x 10^-3 mole

4. Calculate mole of hydrogens equivalent to 4.71 x 10^-3 mole styrene. Use mole ratio from step 2.

mole H = 4.71 x 10^-3 mole styrene * 8 moles H/1 mole styrene

mole H = 0.0377 mole

5. Find number of H atoms contained in 0.0377 mole of hydrogen atoms. Use Avogadro's number.

no. of H atoms = 0.0377 mole H * 6.02 x 10^23 atoms H/1mole H

no. of H atoms = 2.27 x 10^22 atoms H

In what parts of your daily life might you need to calculate the percentage composition of something?

Answers

The percentage composition of a substance is determined to analyze how much of an element is present in the substance and and why they needed.

What is percentage composition ?

The percentage composition of a compound or element in a mixture is the ratio of mass of the element to the total mass multiplied by 100.

here are many scenarios in daily life where calculating the percentage composition of something may be useful, such as:

Cooking and baking: When following a recipe, it may be necessary to calculate the percentage of ingredients used in a recipe to adjust the quantities.

Nutrition: When tracking your diet, you may need to calculate the percentage composition of macronutrients like protein, carbohydrates, and fat.

Finance: When creating a budget, you may need to calculate the percentage of income allocated to different expenses, such as housing, transportation, and food.

Chemistry: In chemistry, calculating the percentage composition of a compound is an essential step in determining its chemical formula and properties.

Manufacturing: In manufacturing, calculating the percentage composition of raw materials and finished products is important for quality control and cost analysis.

Medicine: In medicine, calculating the percentage of drugs in a medication is essential for prescribing the appropriate dose.

These are just a few examples, but there are many other scenarios where calculating percentage composition is useful.

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when you are shopping or filling gas or when your figueing out how much food you should eat.

I need help! In an equilibrium reaction with a Keq of 1 × 108 A. products are favored. B. the reaction is nonspontaneous. C. the reaction is endothermic. D. reactants are favored.

Answers

When K is > than 1 products are favored. When q is < less than 1 reactants are favored. 1 x 108 = 108 which is > 1 so products are favored.

Answer: The correct answer is Option A.

Explanation:

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants. It is represented as $K_(eq)$

For the general reaction:

$A+B\rightarrow C+D$

Expression for equilibrium constant is given as:

$K_(eq)=([C][D])/([A][B])$

Conditions for $K_(eq)$ are:

$K_(eq)>1$ , then products are favored

$K_(eq)=1$ , then forward reaction is equal to backward reaction

$K_(eq)<1$ , then reactants are favored

As, $K_(eq)=1* 10^8$ and is very much greater than 1, so products will be favored.

Hence, the correct answer is Option A.

Which is bigger mL or quarts

Answers

Your answer would be Quarts .

A quart is bigger because 1 quart= 946.353 ml. I hope this helps. :)

Physical activity and exercise typically lead to __________.a. increased stress
b. depression
c. higher energy levels
d. reduced quality of life

Answers

Physical activity and exercise typically lead to higher energy levels. As your body gets used to working hard consistently, you tend to be more prepared and in better physical condition. Your body begins to learn that you should burn up calories quickly to prepare to be active, and this results in increased energy levels even when you're not currently exercising.

Physical activity and exercise typically lead to higher energy levels and the correct option is option C.

Engaging in regular physical activity stimulates various physiological responses in the body, including increased blood flow and oxygen delivery to the muscles, improved metabolism, and release of endorphins, which are natural mood-enhancing chemicals. These effects contribute to a boost in energy levels and feelings of alertness.

Additionally, exercise can improve overall fitness and stamina, allowing individuals to perform daily activities with less fatigue. Regular physical activity is also associated with improved sleep quality, which further enhances energy levels during waking hours.

Thus, the ideal selection is option C.

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