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3 years ago

Could someone please help me??

Chemistry

2 answers:

gizmo_the_mogwai [7]3 years ago

8 0

7.9×10^-1 Kg/m³

or, 0.79 Kg/m³

Hope it helps you...

zloy xaker [14]3 years ago

8 0

Answer:

okay in converting g to kg divide my 1000 and in converting cm³ to m³ divide by 1000000

7.9 x 10^-4 g/cm³ to kg/m³

we divide by 1000 and at the same time by 1000000

so that gives 1000000/1000 (it flips)

so we have 7.9 x 10^-4 x 1000000/1000

that gives 7.9 x 10 ^-1 kg/m³

which is 0. 79 kg/m³

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Will mark the brainiest later for correct answers! Please show work.

Elodia [21]

Answer:

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To calculate the moles, we use the equation:

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$\text{Number of moles}=\frac{\text{Given molecules}}{\text {Avogadros number}}$

a. moles in 14.08 g of $C_{12}H_{22}O_{11}$ = $\frac{14.08g}{342.3g/mol}=0.04113moles$

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b. moles in 17.75 g of NaCl = $\frac{17.75g}{58.5g/mol}=0.3034moles$

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formula units 17.75 g of $NaCl$ = $0.3034\times 6.023\times 10^{23}=1.827\times 10^{23}$

c. moles in 20.06 g of $CuSO_4.5H_2O$ = $\frac{20.06g}{249.68g/mol}=0.08034moles$

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3 years ago

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2 years ago

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maks197457 [2]

Answer:

A. 68°F

B. 293K

Explanation:

The temperature (celsius) = 20.0°C

A. Conversion of the temperature in celsius to fahrenheit.

This is illustrated below:

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C = 20°C

°F = 9C/5 + 32

°F = 9x20/5 + 32

°F = 36 + 32

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3 years ago

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jekas [21]

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3 years ago

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Answer:

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Explanation:

First we convert 750.0 mL into L:

750.0 mL / 1000 = 0.750 L

Then we calculate the required number of moles of CaCl₂, using the definition of molarity:

Molarity = moles / liters

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6 0

3 years ago