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3 years ago

Which of the following is an element? A. CO2 B. H2O C. Xy D. Na

Chemistry

1 answer:

max2010maxim [7]3 years ago

3 0

I believe the answer is D

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Cow’s milk is 4.5% by mass of lactose. Calculate the mass of lactose present in 175 g of<br> milk

Reptile [31]

Answer:

7.875 grams

Explanation:

You multiply 175 g by .045

This gives you 7.875 grams of lactose

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3 years ago

Nitrogen monoxide is produced by combustion in an automobile engine. What volume of oxygen gas is required to react completely w

Dmitrij [34]

Answer:

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Explanation:

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3 years ago

Which of the following occupies a volume?<br><br> solids<br> liquids<br> gases<br> all of the above

nataly862011 [7]

Solids occupy a volume

7 0

3 years ago

Read 2 more answers

A solution is made by mixing equal masses of methanol, CH 4 O , and ethanol, C 2 H 6 O . Determine the mole fraction of each com

Fynjy0 [20]

Answer:

Mole fraction of $CH_4O$ = 0.58

Mole fraction of $C_2H_6O$ = 0.42

Explanation:

Let the mass of $CH_4O$ and $C_2H_6O$ = x g

Molar mass of $CH_4O$ = 33.035 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles_{CH_4O}= \frac{x\ g}{33.035\ g/mol}$

$Moles_{CH_4O}=\frac{x}{33.035}\ mol$

Molar mass of $C_2H_6O$ = 46.07 g/mol

Thus,

$Moles= \frac{x\ g}{46.07\ g/mol}$

$Moles_{C_2H_6O}=\frac{x}{46.07}\ mol$

So, according to definition of mole fraction:

$Mole\ fraction\ of\ CH_4O=\frac {n_{CH_4O}}{n_{CH_4O}+n_{C_2H_6O}}$

$Mole\ fraction\ of\ CH_4O=\frac{\frac{x}{33.035}}{\frac{x}{33.035}+\frac{x}{46.07}}=0.58$

Mole fraction of $C_2H_6O$ = 1 - 0.58 = 0.42

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3 years ago

The moving of molecules from areas of high concentration to that of low concentration to gain energy is best described as

seropon [69]

The moving of molecules from areas of high concentration to that of low concentration to gain energy is best described as passive transport

<h3>What is passive transport?</h3>

Passive transport is a type of membrane transport in which chemicals are moved across cell membranes without using energy. Unlike active transport, which uses cellular energy, passive transport uses the second law of thermodynamics to cause the movement of substances across cell membranes.

<h3>Why is passive transport important?</h3>

Passive transport processes are critical to homeostasis. They maintain proper conditions inside the cell and the organism as a whole by letting chemicals to pass into and out of the cell.

To know more about Passive transport visit:

brainly.com/question/13542102

#SPJ4

7 0

2 years ago