6. Which of the following units would be MOST appropriate for measuring

Which of the following would be expected to dissolve readily in the nonpolar solvent CCl4?

ratelena [41]

<em>The given answer would dissolve readily in the nonpolar solvent CCl4;</em>

D. Grease

<u>Because water molecules are polar, they interact with the sodium and chloride ions. In general, polar solvents dissolve polar solutes, and nonpolar solvents dissolve nonpolar solutes. </u>

3 0

4 years ago

Given the following equation: 4 Fe + 3022 Fe2O3 What mass of iron is needed

icang [17]

Answer : The mass of iron needed is 29.5 grams.

Explanation : Given,

Mass of $O_2$ = 12 g

Molar mass of $O_2$ = 32 g/mol

First we have to calculate the moles of $O_2$ .

$\text{Moles of }O_2=\frac{\text{Given mass }O_2}{\text{Molar mass }O_2}$

$\text{Moles of }O_2=\frac{12g}{32g/mol}=0.375mol$

Now we have to calculate the moles of $Fe$

The balanced chemical equation is:

$4Fe+3O_2\rightarrow 2Fe_2O_3$

From the reaction, we conclude that

As, 3 moles of $O_2$ react with 4 moles of $Fe$

So, 0.375 mole of $O_2$ react with $\frac{4}{3}\times 0.375=0.5$ mole of $Fe$

Now we have to calculate the mass of $Fe$

$\text{ Mass of }Fe=\text{ Moles of }Fe\times \text{ Molar mass of }Fe$

Molar mass of $Fe$ = 59 g/mole

$\text{ Mass of }Fe=(0.5moles)\times (59g/mole)=29.5g$

Therefore, the mass of iron needed is 29.5 grams.

8 0

4 years ago

If the dosage for a medication is 225mg/lb, how many grams should a 25-lb child be given?

Oksanka [162]

Answer:

5.625 grams

Explanation:

Start your equation with what you have been given. Place the units you need in your answer on the right side of the equal sign.

225mg

----------- X ----------- X ------------- = ? g

lb

Now start to fill in your equation and use a conversions to get rid of the units you don't want. Convert mg into grams first. The child's weight (25 lb) is placed over 1 just to get the equation lined up properly so you can see how the units cancel out.

225 mg 1 g 25 lb 5.625 g

--------------- X --------------- X ------------- = ---------------

lb 1000 mg 1 1

The lb on the top and bottom cancel each other out and you are left with just grams. Even though it is over one, that is the same at just 5.625 grams.

3 0

3 years ago

How many grams of Aldol product can be produced from the complete reaction of 0.2 grams of vanillin with an excess of acetone in

Inga [223]

Answer:

There is 0.25 grams of C11H12O3 produced

Explanation:

Step1: Data given

vanillin = C8H8O3

Mass of vanillin = 0.2 grams

Molar mass of vanillin = 152.15 g/mol

Acetone = 58.08 g/mol

Step 2: The balanced equation

C8H8O3 + C3H6O → H2O + C11H12O3

Step 3: Calculate moles of C8H8O3

Moles C8H8O3 = mass / molar mass

Moles C8H8O3 = 0.2 grams / 152.15 g/mol

Moles C8H8O3 = 0.0013 moles

Step 4: Calculate moles of C11H12O3

For 1 mol vanillin we need 1 mol acetone to produce 1 mol C11H12O3

Step 5: Calculate mass of C11H12O3

Mass C11H12O3 = moles * molar mass

Mass C11H12O3 = 0.0013 moles * 192.21 g/mol

Mass C11H12O3 = 0.25 grams

There is 0.25 grams of C11H12O3 produced

5 0

3 years ago

What’s the balanced equation of sodium hydroxide + carbon dioxide produces sodium carbonate + water?

NemiM [27]

2NaOH+CO2=Na2CO3+H20

6 0

3 years ago