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stepladder [879]
3 years ago
8

What mass of helium is in a 2.00L ballon at STP

Chemistry
1 answer:
MAXImum [283]3 years ago
6 0

Answer:

0.357 g He

Explanation:

1 mol of gas at STP = 22.4 L

2.00 L * 1 mol/22.4 L = 0.08929 mol He

M(He) = 4.00 g/mol

0.08929 mol He * 4.00 g/ 1 mol He = 0.357 g He

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A 1.450 g sample of an unknown organic compound , X, is dissolved in 15.0 g of toluene
muminat

Answer:

Molecular weight of the compound = 372.13 g/mol

Explanation:

Depression in freezing point is related with molality of the solution as:

\Delta T_f = K_f \times m

Where,

\Delta T_f = Depression in freezing point

K_f = Molal depression constant

m = Molality

\Delta T_f = K_f \times m

1.33 = 5.12 \times m

m = 0.26

Molality = \frac{Moles\ of\ solute}{Mass\ of\ solvent\ in\ kg}

Mass of solvent (toluene) = 15.0 g = 0.015 kg

0.26 = \frac{Mole\ of\ compound}{0.015}

Moles of compound = 0.015 × 0.26 = 0.00389 mol

Mol = \frac{Mass\ in\ g}{Molecular\ weight}

Mass of the compound = 1.450 g

Molecular\ weight = \frac{Mass\ in\ g}{Moles}

Molecular weight = \frac{1.450}{0.00389} = 372.13\ g/mol

4 0
2 years ago
How much energy is required to raise the temperature of 0.2 kg of aluminum
Ann [662]
B. 538 j hoped this helps
3 0
3 years ago
What volume will be occupied by .756 mole of gas at 109 kPa and 30.5 degrees C
olga2289 [7]

Answer: it would be 0.026 moles

Explanation: PV=nRT, P is the pressure of gas, V is the volume it occupies n is the number of moles of gas present in the sample, R is the universal gas constant which is equal to 0.0821 atm L/mol K and T is the absolute temperature of the gas

8 0
3 years ago
Physical properties of Ammonium <br> Sulphate
Sliva [168]

the physical properties of ammonium  sulphate are colorless gas, less dense than air, pungent shell, very soluble in water, alkaline gas

6 0
2 years ago
On the basis of the information below, the dissolution of FeF2(s) in acidic solution is A. thermodynamically favorable, because
antoniya [11.8K]

Since K3 is greater than 1, the reaction is thermodynamically favorable.

Data;

  • FeF2 is in an acidic solution
  • K2 > 1 is thermodynamically favorable
  • k3 > 1 is not thermodynamically favorable
  • K1<1 is not thermodynamically favorable

<h3>Hess Law</h3>

This states that the heat change in a given chemical reaction is the same irrespective of the number of process in which the reaction is effected.

Using Hess Law;

rxn_3 = rxn_1 * 2rxn_2\\k_3 = k_1 * k_2^2\\k_3 = 2*10^-^6 * (1*10^3)^2\\k_3 = 2

substituting this using Gibbs law,

\delta G^0_3 = -RT\ln K_3\\\delta G^0_3 < 0

Since K3 is greater than 1, the reaction is thermodynamically favorable.

Learn more on Hess law here;

brainly.com/question/12895682

8 0
2 years ago
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