The mass of AgNO₃ present in the given solution will be 5.31grams.
The molality is defined as moles of solute, which in your case is silver nitrate, per kilogram of the solvent. This means that the solution's molality essentially tells about the number of moles of solute present in 1 kg of solvent.
In this case, a 0.250 molal solution would contain 0.250 moles of solute for every 1 kg of solvent. The problem tells that we have 125 g of solvent available. Using the solution's molality as a conversion factor to calculate how many moles of silver nitrate it must contain and we should not forget to convert the mass of solvent from grams to kilograms
Now, we know that silver nitrate has a molar mass of 169.87 g mol⁻¹, which means that the one mole of silver nitrate has a mass of 169.87 g
We can thus say that 0.03125 moles of silver nitrate will have a mass of 0.03125 moles of AgNO₃ × 169.87/ 1 mole of AgNO₃
=5.31g
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Answer:
2 liters of HBr is needed to completely react with the 50 g of salt.
Explanation:
First of all, we determine the reaction:
2HBr + CaCO₃ → CaBr₂ + CO₂ + H₂O
We need to calculate, moles of carbonate in order to state the stoichiometry (1:2)
50 g . 1mol / 100.08g = 0.499 mol
1 mol of salt need 2 moles of acid to react, according to stoichiometry
Then, 0.499 moles of salt, will react with (0.499 . 2)/1 = 0.999 moles
As we have the [HBr], we can calculate the volume.
M = mol/L → we replace → 0.50 mol/L = 0.999 mol /L
L = 0.999 mol/0.50 mol → 1.99 L ≅ 2L
Answer:
B. gas mixed with a liquid
Explanation:
because:
A. a solid can't dissolve in a liquid.
C. two liquids mixed isn't a solution
D. Not All of the above for sure.
Inertia. Inertia is the natural tendency of bodies to remain in their states of either rectilinear or resting motion.