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sashaice [31]
3 years ago
14

A sugar solution consists of 0.25

Chemistry
1 answer:
leonid [27]3 years ago
4 0

Answer:

Explanation:

Your goal when trying to find a solution's molarity is to determine how many moles of solute you have in one liter of solution.

Notice that your solution has a volume of 100.0 mL. Since

∣∣ ∣∣¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯aa1 L=103mLaa∣∣−−−−−−−−−−−−−−−−

you can say that your solution has a volume that is equivalent to 110th of 1 L. Therefore, the number of moles that will be present in your sample will represent 110th of the number of moles present in 1 L of this solution.

So, use sucrose's molar mass to find the number of moles present in your sample

10.0g⋅1 mole sucrose342.34g=0.02921 moles sucrose

So, if this is how many moles you have in 100.0 mL of this solution, it follows that 1 L will contain

1L solution⋅103mL solution1L solution⋅0.02921 moles100mL solution=0.2921 moles

You get 0.2921 moles of sucrose, you solute, per liter of solution, which means that the solution's molarity will be

molarity=c=∣∣ ∣∣¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯aa0.292 mol L−1aa∣∣−−−−−−−−−−−−−−−−−

The answer is rounded to three sig figs.

Answer link

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Answer:

16.9g of H₂O can be formed

Explanation:

Based on the chemical reaction, 2 moles of H₂ react per mole of O₂. To anser this question we must find limiting reactant converting the mass and volume of each reactant to moles:

<em>Moles H₂ -Molar mass: 2.016g/mol-:</em>

8.76g * (1mol / 2.016g) = 4.345 moles

<em>Moles O₂:</em>

PV = nRT

PV/RT = n

P = 1atm at STP

V = 10.5L

R = 0.082atmL/molK

T = 273.15K at STP

n = 1atm*10.5L / 0.082atmL/molK*273.15K

n = 0.469 moles of oxygen

For a complete reaction of 4.345 moles moles of hydrogen are required:

4.345 moles H2 * (1mol O2 / 2mol H2) = 2.173 moles of O2 are required. As there are just 0.469 moles, Oxygen is limiting reactant

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0.469 moles O₂ * (2 moles H₂O / 1mol O₂) = 0.938 moles H₂O.

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<h3>16.9g of H₂O can be formed</h3>
8 0
3 years ago
Steps of scientific inquiry?
vlabodo [156]
1. Figure out a problem
2. Research
3. Hypothesis  
4. Experiment
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