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3 years ago

Which has a larger molar mass, salt (NaCl) or sugar (C12H22011) – how can you tell?

Chemistry

1 answer:

uysha [10]3 years ago

4 0

Answer:

Explanation:

Molar mass of NaCl = (23+35.5)

Molar mass of NaCl = 58.5g/mol

Molar mass of C12H22011

= 12(12) + 22(1) + 16(11)

= 144 +22 + 176

= 342g/mol

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An insulated container contains 0.3 kg of water at 20 degrees C. An alloy with a mass of 0.090 kg and an initial temperature of

Lorico [155]

Answer:

The specific heat of the alloy is 2.324 J/g°C

Explanation:

<u>Step 1:</u> Data given

Mass of water = 0.3 kg = 300 grams

Temperature of water = 20°C

Mass of alloy = 0.090 kg

Initial temperature of alloy = 55 °C

The final temperature = 25°C

The specific heat of water = 4.184 J/g°C

<u>Step 2:</u> Calculate the specific heat of alloy

Qlost = -Qwater

Qmetal = -Qwater

Q = m*c*ΔT

m(alloy) * c(alloy) * ΔT(alloy) = -m(water)*c(water)*ΔT(water)

⇒ mass of alloy = 90 grams

⇒ c(alloy) = the specific heat of alloy = TO BE DETERMINED

⇒ ΔT(alloy) = The change of temperature = T2 - T1 = 25-55 = -30°C

⇒ mass of water = 300 grams

⇒ c(water) = the specific heat of water = 4.184 J/g°C

⇒ ΔT(water) = The change of temperature = T2 - T1 = 25 - 20 = 5 °C

90 * c(alloy) * -30°C = -300 * 4.184 J/g°C * 5°C

c(alloy) = 2.324 J/g°C

The specific heat of the alloy is 2.324 J/g°C

3 0

3 years ago

Part B Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution

MissTica

Answer:

0,508g of H₂O₂

Explanation:

For the reaction:

2KMnO₄(aq) + H₂O₂(aq) + 3H₂SO₄(aq) → 3O₂(g) + 2MnSO₄(aq) + K₂SO₄(aq) + 4H₂O(l)

2 moles of KMnO₄ react with 1 mol of H₂O₂.

In the titration, moles of KMnO₄ required were:

1,68M×0,0178L = 0,0299 moles of KMnO₄. Moles of H₂O₂ are:

0,0299 moles of KMnO₄× $\frac{1molH_{2}O_{2}}{2molKMnO_{4}}$ = 0,01495 moles of H₂O₂. As molar mass of H₂O₂ is 34,01g/mol, mass of H₂O₂ was dissolved is:

0,01495 moles of H₂O₂× $\frac{34,01g}{1molH_{2}O_{2}}$ = <em>0,508g of H₂O₂</em>

5 0

2 years ago

In order to use polysaccharides as an energy source, one must

SpyIntel [72]

Answer:d.break them down to monosaccharides

Explanation:

Polysaccharides are polymers made of monosaccharide monomers. The polysaccharides do not release energy except the monosacharides are broken down to monosaccharides by stepwise hydrolysis. To obtain energy from polysaccharides, the constituent monosacharides are obtained and these are now involved in the biological cycles that liberate energy.

8 0

3 years ago

4) I have a 52.4 g sample of lead with a volume of 10 cm3. What is its density?

ki77a [65]

Answer:

<h2>Density = 5.24 g/cm³</h2>

Explanation:

The density of a substance can be found by using the formula

<h3> $Density = \frac{mass}{volume}$ </h3>

From the question

mass = 52.4 g

volume = 10 cm³

Substitute the values into the above formula and solve for the density

That's

<h3> $Density = \frac{52.4}{10}$ </h3>

We have the final answer as

<h3>Density = 5.24 g/cm³</h3>

Hope this helps you

5 0

3 years ago

What is an example of making an inference to support comprehension? In three to five sentences, explain your answer. 20 points

Elena-2011 [213]

Answer:

For example, a student looking at the picture of the baby could state the obvious by saying the baby is crying. ... When students predict, they guess what will happen next based on what they already know from the text and their background knowledge. When students infer, they make a guess about what is currently happening.

Explanation:

Hope that helps

Have I good day

Can I have brain pls

8 0

2 years ago