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2 years ago

Can someone please help me with this, I’ll give Brainly!

Chemistry

1 answer:

Art [367]2 years ago

5 0

Answer:

Explanation:

See attached table.

Note that:

1 mole = 6.02x10^23

Molar mass is grams/mole. For the elements, the atomic mass is the same number as molar mass, just expressed as grams/mole.

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An aqueous soulution contains 30% C3H7OH and 70% water by mass. what are the mole fractions of each substance in the solution?

sattari [20]

Answer:

Mole fraction of water = 0.88

Mole fraction of $\chi_{C_{3}H_{7}OH}$ = 0.12

Explanation:

30% $C_{3}H_{7}OH$ means 30 g of $C_{3}H_{7}OH$ is present in 100 g of solution.

70% $H_{2}O$ (water) means 70 g of water is present in 100 g of solution

$n=\frac{given\ mass}{molar\ mass}$

Calculation of MOLES

Molar mass of $H_{2}O$ = 18 g/mol

$n_{water}=\frac{70}{18}$

$n_{water} = 3.89\ moles$

moles of water = 3.89 moles

Molar mass of $C_{3}H_{7}OH$ = 3(12) + 7(1) + 1(16) +1(1)

= 36 +7+16+1

molar mass of $C_{3}H_{7}OH$ = 60 g/mol

$n_{C_{3}H_{7}OH}=\frac{30}{60}$

$n_{C_{3}H_{7}OH} = 0.5\ moles$

moles of $C_{3}H_{7}OH$ = 0.5 moles

total moles of solution = 0.5 + 3.89 = 4.39 moles

Calculation of MOLE FRACTION

Formula for mole fraction is :

$\chi=\frac{moles\ of\ solute}{moles\ of\ solution}$

$\chi_{water}=\frac{moles\ of\ water}{Total\ moles}$

$\chi_{water}=\frac{3.89}{4.39}$

$\chi_{water}= 0.88$

Similarly,

$\chi_{C_{3}H_{7}OH} = \frac{moles\ of\ C_{3}H_{7}OH}{Total\ moles}$

$\chi_{C_{3}H_{7}OH} = \frac{0.5}{4.39}$

$\chi_{C_{3}H_{7}OH} = 0.12$

Mole fraction of water = 0.88

Mole fraction of $\chi_{C_{3}H_{7}OH}$ = 0.12

Note :

$\chi_{C_{3}H_{7}OH} + \chi_{H_{2}O} = 1$

4 0

2 years ago

A wave has 9.2 x 10-22 ) of energy. What is its wavelength?

blagie [28]

Answer:

$\lambda=2.2x10^{-4}m$

Explanation:

Hello!

In this case, since the relationship between energy and wavelength is defined via the speed of light and the Planck's constant as shown below:

$e=\frac{c*h}{\lambda}$

Since c stands for the speed of light and h for the so-called Planck's constant, we can compute the wavelength as follows:

$\lambda=\frac{c*h}{e}=\frac{3.0x10^8m/s*6.626x10^{-34}J*s}{9.2x10^{-22}J}\\\\\lambda=2.2x10^{-4}m$

Best regards!

3 0

2 years ago

Which of the following is a physical model of the Sun? A. an equation that describes the Sun’s motion B. a chart that lists the

Bezzdna [24]

Answer:

It would be E. A small yellow ball that represents the Sun Reset Next i got the answer from somebody else

Explanation:

hope this helps :)

4 0

1 year ago

Kaia, a chemical engineering graduate, has documented all titration procedures in her project report. She refers to this report

vagabundo [1.1K]

Answer:

The correct option is;

d. Explicit knowledge

Explanation:

Explicit knowledge is the knowledge that can be easily articulated documented stored in a retrieval system accesses, transmitted and shared with others

Tacit knowledge is the skill developed by an individual based on actual experience such that such knowledge comprise of both facts and perspectives

Hence explicit knowledge and tacit knowledge are complementary

The operations performed by Kaia include documentation, storing in a retrieval system (her project report) and accessing what she documented, this is an example of explicit knowledge.

7 0

3 years ago

Please help!!!!! The question is in the answer..

elena-s [515]

Answer:-149.7

Explanation:

4 0

3 years ago