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3 years ago

10

One person is pulling with a force of 250 newtons and the other person is pulling with a force of 200 newtons. The total force o

n the cart is

1 answer:

dangina [55]3 years ago

6 0

Answer:

450

Explanation:

i add the 200 to 250

200

+250

450

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When of glycine are dissolved in of a certain mystery liquid , the freezing point of the solution is lower than the freezing poi

Nesterboy [21]

The given question is incomplete. The complete question is:

When 282. g of glycine (C2H5NO2) are dissolved in 950. g of a certain mystery liquid X, the freezing point of the solution is 8.2C lower than the freezing point of pure X. On the other hand, when 282. g of ammonium chloride are dissolved in the same mass of X, the freezing point of the solution is 20.0C lower than the freezing point of pure X. Calculate the van't Hoff factor for ammonium chloride in X.

Answer: the van't Hoff factor for ammonium chloride is 1.74

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=T_f^0-T_f=8.2^0C$ = Depression in freezing point

$K_f$ = freezing point constant = ?

i = 1 ( for non electrolyte)

m= molality

$8.2^0C=1\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}$

Weight of solvent (X)= 950 g = 0.95 kg

Molar mass of solute (glycine) = 75.07 g/mol

Mass of solute (glycine) = 282 g

$8.2^0C=1\times K_f\times \frac{282g}{75.07g/mol\times 0.95kg}$

$K_f=2.07$

ii) $20.0^0C=i\times \times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}$

Weight of solvent (X)= 950 g = 0.95 kg

Molar mass of solute (ammonium chloride) = 53.49 g/mol

Mass of solute (ammonium chloride) = 282 g

$20.0^0C=i\times 2.07\times \frac{282g}{53.49g/mol\times 0.95kg}$

$i=1.74$

Thus the van't Hoff factor for ammonium chloride is 1.74

4 0

3 years ago

2H2 + O2 -> 2H20

irina [24]

Answer:

144.08 g of H₂O

Explanation:

The balance chemical equation for the synthesis of water is as follow;

2 H₂ + O₂ → 2 H₂O

Step 1: <u>Find out moles of H₂O produced as;</u>

According to balance chemical equation,

1 mole of O₂ produced = 2 moles of H₂O

So,

4 moles of O₂ will produce = X moles of H₂O

Solving for X,

X = 4 mol × 2 mol / 1 mol

X = 8 moles of H₂O

Step 2: <u>Calculate Mass of H₂O as;</u>

Mass = Moles × M.Mass

Mass = 8 mol × 18.01 g/mol

Mass = 144.08 g of H₂O

6 0

3 years ago

According to Jeff Bezos, founder of Amazon.com, the _____ refers to markets that are too small to justify a mass media campaign,

Y_Kistochka [10]

Answer: A) Hard middle

Explanation: He describes the hard middle as a marketing campaign in which one doesn't get much profit per sale of product (usually inexpensive) to a not so large target audience.

8 0

4 years ago

How many asymmetric centers are present in the open chain form of the aldohexose D-(-)-gulose?

bulgar [2K]

Answer:

D) 4

Explanation:

If we want to find the asymmetric centers, we must first remember that in an asymmetric center, in the carbon, we will have 4 different types of groups bonded to it.

Therefore we must look for carbons that have 4 different groups. With this in mind, we can look at each carbon.

<u>Carbon 1</u>

In this carbon, we have two bonds with the oxygen, therefore, we dont have 4 different groups. So, this is not an asymmetric center.

<u>Carbon 2</u>

In this carbon, we have an "OH" in the top, an hydrogen in the bottom a carbonyl group in the right, and a CHOH in the left. We have 4 different groups. So, this is an asymmetric center.

<u>Carbon 3</u>

In this carbon, we have an "OH" at the bottom, an hydrogen in the top, a CHOH group in the right (that is bonded to a carbonyl group), and a CHOH in the left. We have 4 different groups. So, this is an asymmetric center.

<u>Carbon 4</u>

In this carbon, we have an "OH" at the top, an hydrogen in the bottom a CHOH group in the right (that is bonded to a CHOH group), and a CHOH in the left. We have 4 different groups. So, this is an asymmetric center.

<u>Carbon 5</u>

In this carbon, we have an "OH" at the bottom, an hydrogen in the top, a CHOH group in the right (that is bonded to a CHOH), and a CH2OH in the left. We have 4 different groups. So, this is an asymmetric center.

<u>Carbon 6</u>

In this carbon, we have two bonds with hydrogens, therefore, we dont have 4 different groups. So, this is not an asymmetric center.

See figure 1

I hope it helps!

4 0

3 years ago

Which statement describes the quantum mechanical model of the atom

notka56 [123]

Two models of atomic structure are in use today: the Bohr model and the quantum mechanical model. The quantum mechanical model is based on mathematics. Although it is more difficult to understand than the Bohr model, it can be used to explain observations made on complex atoms.

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3 years ago