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2 years ago

Help pls I will mark brainlest

Chemistry

1 answer:

defon2 years ago

4 0

Resources found in lithosphere: gold and iron etc

Resources found in atmosphere: Water vapor, gases etc.

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How many carbon atoms are contained in 2.8 g of c2h4 ?

MrRa [10]

Answer:

The answer to your question is: 1.205 x 10²³ atoms of Carbon

Explanation:

Data

Carbons atoms contained in 2.8 g C₂ H₄

MW C₂ H₄ = (12 x 2) + (4 x 1) = 24 + 4 = 28 g

28 g of C₂ H₄ ---------------- 24 g of carbon

2.8 g C₂ H₄ ----------------- x

x = (2.8)(24) / (28)

= 2.4 grams of C

1 mol ------------------- 12 g of Carbon

x ------------------- 2.4 g

x = (2.4x 1) / 12 = 0.2 mol

1 mol ----------------- 6.023 x 10 ²³ atoms

0.2 mol -------------- x

x = (0.2 x 6.023 x 10 ²³) / 1

= 1.205 x 10²³ atoms

8 0

3 years ago

Read 2 more answers

Would an element with 7 valence electrons be more or less reactive than an element with 3 valence electrons?

Sedbober [7]

Answer:

That would be more

Explanation:

5 0

3 years ago

A crane lifts a 5,800-N block from the ground to 20 m above the ground in 80 seconds. How much Power

earnstyle [38]

Answer:

1450 W

Explanation:

<u>5800n x 20m</u> =1450w

80s

3 0

3 years ago

Identifying the Reddish-Brown Substance (continued)

antiseptic1488 [7]

Here's link to the answer:

tinyurl.com/wpazsebu

4 0

2 years ago

The The thermal conductivity of a sheet of rigid, extruded insulation is reported to be k=0.029 W/ m measured temperature differ

vfiekz [6]

Answer:

Heat flux = 13.92 W/m2

Rate of heat transfer throug the 3m x 3m sheet = 125.28 W

The thermal resistance of the 3x3m sheet is 0.0958 K/W

Explanation:

The rate of heat transfer through a 3m x 3m sheet of insulation can be calculated as:

$q=-k*A*\frac{\Delta T}{\Delta X}\\\\q=-0.029\frac{W}{m*K}*(3m*3m)*\frac{12K}{0.025m} =125.28W$

The heat flux can be defined as the amount of heat flow by unit of area.

Using the previous calculation, we can estimate the heat flux:

$heat \, flux=\frac{q}{A}=\frac{125.28 W}{9 m^{2} } =13.92 W/m^{2}$

It can also be calculated as:

$q/A=-k*\frac{\Delta T}{\Delta X}$

The thermal resistance can be expressed as

$\Delta T=R_t*Q\\R_t=\Delta T/Q=\frac{\Delta X}{k*A}$

For the 3m x 3m sheet, the thermal resistance is

$R_t = \frac{\Delta X}{k*A}=\frac{0.025m}{0.029W/mK*9m^{2}}=0.0958 \, K/W$

4 0

3 years ago

Help pls I will mark brainlest​

Help pls I will mark brainlest