HELP I need these 2 questions answered

Answer:

82.416 g of KNO ₃  is needed to produce 510.0 mL of a 1.6 M KNO ₃ solution.

Explanation:

Since molarity is the number of moles of solute that are dissolved in a given volume, calculated by dividing the moles of solute by the volume of the solution, the following rule of three can be applied: if in 1 L (1,000 mL) of KNO₃ there are 1.6 moles of the compound present, in 510 mL how many moles will there be?

[tex]moles=\frac{510 mL*1.6 moles}{1000 mL}[/tex]

moles= 0.816

Being the molar mass of the elements:

So the molar mass of the compound KNO₃ is:

KNO₃= 39 g/mole + 14 g/mole + 3*16 g/mole= 101 g/mole

Now I can apply the following rule of three: if in 1 mole of KNO₃ there are 101 g, in 0.816 moles how much mass is there?

[tex]mass=\frac{0.816 moles*101 grams}{1 mole}[/tex]

mass= 82.416 grams

82.416 g of KNO ₃  is needed to produce 510.0 mL of a 1.6 M KNO ₃ solution.

The actual value is greater than the theoretical value

Given

Reaction

Sb2S3 + 3Fe --> 2Sb + 3FeS

0.022 mol Sb2S3

0.08mol Sb

Required

The percent yield

Solution

Percent yield is the comparison of the amount of product obtained from a reaction(actual) with the amount you calculated (theoretical)

General formula:

Percent yield = (Actual yield / theoretical yield )x 100%

Theoretical yield of Sb : 2/1 x 0.022 mol = 0.044 moles

In the question, there seems to be an error, because the actual yield value(0.08=?) should be smaller than the theoretical yield(0.044)

Answer:

4. 12 km.

5. 2 km.

Explanation:

Hello!

In this case, we need to distinguish between two terms:

- Distance traveled: it stands for the total displacement, no matter the initial and final position the body has; it means that the total displacement was:

DT = 3km + 4 km + 3 km + 2 km = 12 km.

- Displacement: it stands for the relationship between the initial position and the final one, it means that the initial position was 0 km and the final one is 2 km away, thus, the displacement is:

D = 2km - 0 km = 2 km.

Best regards!

Answer:

have similar properties

Explanation:

Elements in a column of the periodic table have similar chemical properties.

A periodic column is also called a group or family.

Elements in the same group has the same number of valence electrons.

Therefore, they will combine chemically the same way.

This is not so for the periods on the periodic table.

7.51 × 10²² atoms S

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Step 1: Define

4.00 g S

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of S - 32.07 g/mol

Step 3: Convert

Step 4: Check

Follow sig figs and round. We are given 3 sig figs.

7.51107 × 10²² atoms S ≈ 7.51 × 10²² atoms S

Answer:

16.06 g

Explanation:

Reaction equation;

S(s) + 3F2(g) ----> SF6(s)

Number of moles of sulphur reacted = 3.5g/32g/mol = 0.11 moles

If 1 mole of sulphur yields 1 mole of SF6

Then 0.11 moles of sulphur yields 0.11 moles of SF6

Also

Number of moles of fluorine = 4.5g/38 g/mol= 0.12 moles

Hence sulphur his the limiting reactant;

Maximum amount of SF6 = 0.11 × 146 = 16.06 g

Answer:

1. Nucleotides

2. Amino acids

3. Monosaccharides

Explanation:

There are four major biological polymers in nature namely: carbohydrate (polysaccharides), lipids, proteins and nucleic acids. These polymers are formed from smaller units called MONOMERS, which are linked together via chemical bonds. The monomeric units of the polymers are listed below:

- Carbohydrates or polysaccharides are polymers of monomers called MONOSACCHARIDES linked by glycosidic bonds.

- Nucleic acids are polymers of monomers called NUCLEOTIDES linked by phosphodiester bonds.

- Proteins are polymers of monomers called AMINO ACIDS linked by peptide bonds.

Answer:

[tex]\boxed {\boxed {\sf 856.8648 \ grams \ of \ K_2CO_3}}[/tex]

Explanation:

To convert from moles to grams, we must find the molar mass.

1. Molar Mass

First, identify the elements in the compound. K₂CO₃ It has potassium, carbon, and oxygen. Find these elements and their masses on the Periodic Table.

Note the subscript of 2 after K and 3 after O. We must multiply oxygen's molar mass by 2, then oxygen's by 3, and add carbon.

2. Convert Moles to Grams

Use the molar mass as a fraction.

[tex]\frac {138.204 \ g \ K_2CO_3}{1 \ mol \ K_23CO_3}[/tex]

Multiply by the given number of moles: 6.2

[tex]6.2 \ mol \ K_2CO_3 *\frac {138.204 \ g \ K_2CO_3}{1 \ mol \ K_23CO_3}[/tex]

[tex]6.2 *\frac {138.204 \ g \ K_2CO_3}{1 }[/tex]

[tex]6.2 * {138.204 \ g \ K_2CO_3}[/tex]

[tex]856.8648 \ g \ K_2CO_3[/tex]

There are 856.8648 grams of potassium carbonate in 6.2 moles.

Answer:

soil

Explanation:

some organisms aren't plants

The answer is:

A.(soil)

Some organisms need soil but not all, hope this helps!

Answer:

B) Leah kicked the soccer ball with more force than Seth.

Explanation:

The true statement is that Leah kicked the soccer ball with more force compared to Seth.

We know that both balls have the same mass and that Seth's ball went further compared to Leah's ball.

 So;

       Force  = mass x acceleration

We are sure that Leah's ball has a greater acceleration due to the force applied and it will travel farther due to the energy it contains.

Answer:

How many grams Acetic Acid in 1 mol? The answer is 60.05196.

We assume you are converting between grams Acetic Acid and mole?

(人◕ω◕)

Explanation:

You can view more details on each measurement unit:

molecular weight of Acetic Acid or mol

The molecular formula for Acetic Acid is CH3COOH.

The SI base unit for amount of substance is the mole.

1 grams Acetic Acid is equal to 0.016652245821785 mole.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between grams Acetic Acid and mole.

Examples

1 grams Acetic Acid to mol = 0.01665 mol

10 grams Acetic Acid to mol = 0.16652 mol

20 grams Acetic Acid to mol = 0.33304 mol

30 grams Acetic Acid to mol = 0.49957 mol

40 grams Acetic Acid to mol = 0.66609 mol

50 grams Acetic Acid to mol = 0.83261 mol

100 grams Acetic Acid to mol = 1.66522 mol

200 grams Acetic Acid to mol = 3.33045 mol

Answer:

Yes, because it follows the octet rule.

Explanation:

The Lewis is correct

because it follows the octet rule.

And

The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons and thus the electron configuration of a noble gas.

The given question is incomplete. The complete question is:

Suppose a current of 0.920 A is passed through an electroplating cell with an aqueous solution of agno3 in the cathode compartment for 47.0 seconds. Calculate the mass of pure silver deposited on a metal object made into the cathode of the cell.

Answer:   0.0484 g

Explanation:

[tex]Q=I\times t[/tex]

where Q= quantity of electricity in coloumbs

I = current in amperes = 0.920 A

t= time in seconds = 47.0 sec

[tex]Q=0.920A\times 47.0s=43.24C[/tex]

[tex]AgNO_3\rightarrow Ag^++NO_3^-[/tex]

[tex]Ag^++e^-\rightarrow Ag[/tex]

96500 Coloumb of electricity electrolyzes 1 mole of Ag

43.24 C of electricity deposits =[tex]\frac{1}{96500}\times 43.24=0.00045moles[/tex] of Ag

[tex]\text{ mass of Ag}={\text{no of moles}\times {\text{Molar mass}}=0.00045mol\times 108g=0.0484g[/tex]

Thus the mass of pure silver deposited on a metal object made into the cathode of the cell is 0.0484 g

Answer:

2.8 x10^-4

Explanation:

Answer:  In one mole of carbon, we get 12g of carbon

Hope it helped u,

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Answer:

longitudinal

Explanation:

A prime meridian is the meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great circle. This great circle divides a spheroid into two hemispheres.

Answer: A) 1

Explanation:

Lithium is the third element of the periodic table with atomic number of 3. The atomic number is equal to the number of electrons for a neutral atom and thus there are 3 electrons in Lithium.

The electronic configuration of Lithium (Li) is [tex]1s^22s^1[/tex]. Thus it can gain one electron to complete its octet and attain stability. Thus it can form one bond with other atoms.

Example: Lithium can form one bond with flourine to form LiF by losing one electron to form [tex]Li^+[/tex].

Answer:

concentrations of the reactants and products have reached constant values

Explanation:

When a reaction is carried out in a closed system, it attains dynamic equilibrium after sometime. We define dynamic equilibrium as a situation in which the forward and reverse reactions proceed at the same rate.

When this occurs, the concentration of the reactants and products remain fairly constant. Hence the answer.

Answer:

C. Ill only

Explanation:

Motion can be defined as a change in location with respect to a reference point.

This ultimately implies that, motion would occur as a result of a change in location (position) of an object with respect to a reference point or frame of reference i.e where it was standing before the effect of an external force.

Mathematically, the motion of an object is described in terms of acceleration, time, distance, speed, velocity, displacement etc.

A reference point is an object or location from which the movement of another object is determined.

Thus, a point on a map is considered to be a reference point because it represents the starting point of an object or person in motion.

Answer:

1) Heat

Explanation:

Heat Transfer: The movement of heat from a warmer object to a colder one

Answer:

Percent by mass is 69.42% Fe

Explanation:

If the molar mass is 159.69 grams per mol, and our goal is to find the percent by mass of iron, then we need to find the mass of iron first. We will calculate the amu of Iron and divide that by the total molar mass of Fe2O3.. and then multiply by 100 and write with a % in order to find the percent by mass (percent composition)

Fe2 = 2(55.845) = 111.69

111.69/159.69 = 0.69941762164

0.69941762164 * 100 = 69.42% Fe

The study of chemicals is called chemistry.

The correct answer to the question is Percent by mass is 69.42% Fe

If the molar mass is 159.69 grams per mole, and our goal is to find the percent by mass of iron, then we need to find the mass of iron first.

We will calculate the AMU of Iron and divide that by the total molar mass of Fe2O3. and then multiply by 100 and write with a % in order to find the percent by mass (percent composition)

[tex]Fe2 = 2(55.845) = 111.69\\\\\\frac{111.69}{159.69} = 0.69941762164\\\\0.69941762164 * 100 = 69.42% Fe[/tex]

Hence, the correct option answer is 69.42.

For more information about the question, refer to the link:-

https://brainly.com/question/5763151

Answer:

0.00246kg

Explanation:

1g = $40.63

$100 = $100/40.63 = 2.46g

2.46/1000 g = 0.00246kg

Answer:

Carbon is stored on our planet in the following major sinks (1) as organic molecules in living and dead organisms found in the biosphere; (2) as the gas carbon dioxide in the atmosphere; (3) as organic matter in soils; (4) in the lithosphere as fossil fuels and sedimentary rock deposits such as limestone, dolomite

Answer:

69

Explanation:

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1.28 moles of aluminum bromide (AlBr₃) has a mass of 341.35 g.

We want to convert 1.28 moles of aluminum bromide (AlBr₃) to grams. We will need first to calculate its molar mass.

The molar mass is the sum of the total mass in grams of all the atoms that make up a mole of a particular molecule.

M(AlBr₃) = M(Al) + 3 M(Br) = 26.98 g/mol + 3 × 79.90 g/mol =

= 266.68 g/mol

1.28 mol × 266.68 g/mol = 341.35 g

1.28 moles of aluminum bromide (AlBr₃) has a mass of 341.35 g.

Learn more about molar mass here: https://brainly.com/question/5216907

Answer:

b

Explanation:

I did this quiz and i think a got it right i also looked up my answer to make sure it was right good luck on quiz :)

Explanation:

203.31                brainliest

Answer:

203.31g when rounded to 2 decimal places.

Answer:

Neither accurate nor precise

Explanation:

The measurements shown on the table are neither accurate nor precise in value.

Accuracy is the nearness of the measured value to the true value.

Precision is the ability to reproduce a result.