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3 years ago

250 kilograms is how many pounds?

Chemistry

2 answers:

Kruka [31]3 years ago

6 0

Answer:

250 Kg = 551.155655 lb

Explanation:

FinnZ [79.3K]3 years ago

3 0

I’m here for points soooo lol

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A sample of helium gas has a volume of 1.50 L at 159 K and 5.00 atm. When the gas is compressed to 0.200 L at 50.0 atm, the temp

Brums [2.3K]

Answer:

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Explanation:

The given data is as follows.

$V_{1}$ = 1.50 L, $T_{1}$ = 159 K,

$P_{1}$ = 5.00 atm, $V_{2}$ = 0.2 L,

$T_{2}$ = ?, $P_{2}$ = 50.0 atm

And, according to ideal gas equation,

$\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}$

Hence, putting the given values into the above formula to calculate the value of final temperature as follows.

$\frac{5.0 atm \times 1.50 L}{159 K} = \frac{5 atm \times 0.2 L}{T_{2}}$

$T_{2}$ = 21.27 K

Thus, we can conclude that the final temperature is 21.27 K .

5 0

3 years ago

HURRY PLZZZ Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equ

Tresset [83]

Answer:

2 1 1

Explanation:

3 0

3 years ago

Read 2 more answers

Given the following balanced chemical equation:

Fudgin [204]

Answer:

Mass of Ca(OH)₂ required = 0.09 g

Explanation:

Given data:

Volume of HNO₃ = 25 mL (25/1000 = 0.025 L)

Molarity of HNO₃ = 0.100 M

Mass of Ca(OH)₂ required = ?

Solution:

Chemical equation;

Ca(OH)₂ + 2HNO₃ → Ca(NO)₃ + 2H₂O

Number of moles of HNO₃:

Molarity = number of moles / volume in L

0.100 M = number of moles / 0.025 L

Number of moles = 0.100 M ×0.025 L

Number of moles = 0.0025 mol

Now we will compare the moles of Ca(OH)₂ with HNO₃ from balance chemical equation.

HNO₃ : Ca(OH)₂

2 : 1

0.0025 : 1/2×0.0025 = 0.00125

Mass of Ca(OH)₂:

Mass = number of moles × molar mass

Mass = 0.00125 mol × 74.1 g/mol

Mass = 0.09 g

7 0

4 years ago

Acenapthalene has the empirical formula C6H5. A solution of 0.515 g of acenapthalene in 15.0 g CHCl3 boils at 62.5oC. The normal

german

Answer:

The molecular formula of an ascenapthalene is $C_{12}H_{10}$

Explanation:

$\Delta T_b=K_b\times m$

$\Delta T_b=K_b\times \frac{\text{Mass of acenapthalene}}{\text{Molar mass of acenapthalene}\times \text{Mass of chloroform in Kg}}$

where,

$\Delta T_f$ =Elevation in boiling point = $(62.5-61.7)^oC=0.8^oC$

Mass of acenapthalene = 0.515 g

Mass of $CHCl_3$ = 15.0 g = 0.015 kg (1 kg = 1000 g)

$K_b$ = boiling point constant = 3.63 °C/m

m = molality

Now put all the given values in this formula, we get

$0.8^0C=3.67 ^oC/m\times \frac{0.515}{\text{Molar mass of acenapthalene}\times 0.015kg}$

$\text{Molar mass of acenapthalene}=155.7875 g/mol$

Let the molecule formula of the Acenapthalene be $C_{6n]H_{5n}$

$6n\times 12 g/mol+5n\times 1 g/mol=155.7875 g/mol$

n = 2.0

The molecular formula of an ascenapthalene is $C_{12}H_{10}$

4 0

4 years ago

Nuclei<br> 10. Nuclear power plants release energy by

KatRina [158]

Answer:

Nuclear Fission

Explanation:

Nuclear power plants release energy by nuclear fission.

5 0

3 years ago