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TiliK225
2 months ago
3

A sample of N2H4 has a mass of 25g. Identify the numerical quantity that is needed to convert the number of grams of N2H4 to the

number of moles of N2H4. (You do not need to do the actual calculation.)
Chemistry
1 answer:
KiRa [2.9K]2 months ago
8 0

Answer:

Molecular Mass

Explanation:

The question seeks a numerical value. That value is the Molecular Mass. To convert sample mass to moles, divide the sample mass by the molecular mass.

(14g N * 2) + (1g H *4) = 32g / mol of N2H4

The number of moles can be determined by dividing the sample mass by the molecular mass.

25g / 32g = 0.78125 moles

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For each set of dilutions (bleach and mouthwash), the first tube contained a 1:11 dilution (0.5 mL of agent was added to 5.0 mL
eduard [2782]

Response:

Tube 2: 8.26 * 10^-3; Tube 4: 6.83 * 10^-5

Explanation:

For the MIC test's serial dilutions, each tube should contain an equal volume of nutrient broth: 5.0 mL, while the agent's volume per dilution must also match: 0.5 mL.

The serial dilution process followed was:

  • Tube 1: 0.5/5.5
  • Tube 2: 0.5 mL from tube 1 was diluted with 5.0 mL of broth, resulting in a dilution of tube 2 as (1:11) * (1:11) = (0.5/5.5) * (0.5/5.5) = 1:121 = 8.26 * 10^-3
  • Tube 3: similar calculations yield 1:1331 = 7.51 * 10^-4
  • Tube 4: yields 1:14641 = 6.83 * 10^-5.

5 0
1 month ago
For the chemical reaction HCN ( aq ) + KOH ( aq ) ⟶ H 2 O ( l ) + KCN ( aq ) HCN(aq)+KOH(aq)⟶H2O(l)+KCN(aq) write the net ionic
lions [2927]

Answer:

H+(aq) + OH-(aq) ⟶ H2O(l)

Explanation:

Step 1: The balanced equation can be presented as

HCN(aq) + KOH(aq) ⟶ H2O(l) + KCN(aq)

H+(aq) + CN-(aq) + K+(aq) + OH-(aq) ⟶ H2O(l) + K+(aq) + CN-(aq)

Step 2: The net ionic equation is formed by removing the spectator ions — those that appear on both sides of the equation — leading us to the final representation:

H+(aq) + OH-(aq) ⟶ H2O(l)

4 0
1 month ago
Which of the following could be considered a scientific statement?
Anarel [2989]

Answer: D) X-rays exhibit lower frequency than microwaves

Explanation:

A scientific statement is one that relies on evidence gathered from experiments and direct observation of the natural world. Such a statement can be corroborated through appropriate experimental methods.

The option D illustrates a scientific statement because it allows for the frequency of both microwaves and X-rays to be assessed and contrasted. This process entails experimental and observational techniques, which validates it as a scientific statement.

6 0
1 month ago
Read 2 more answers
How many atoms of Mg are present in 97.22 grams of Mg?
VMariaS [2998]

Answer: The correct choice is (b).

Explanation:

We have the mass of Magnesium at 97.22 g, and the molar mass of Magnesium is 24.305 g/mol.

Therefore, the calculation for the number of moles is as follows.

          Number of moles = \frac{mass given in grams}{Molar mass}

                                 = \frac{97.22 g}{24.305 g/mol}  

                                 = 4 mol

Additionally, it is known that one mole contains 6.023 \times 10^{23} atoms/mol. Thus, we calculate the total number of atoms in 4 moles as follows.

               4 mol \times 6.023 \times 10^{23} atoms/mol

               = 24.08 \times 10^{23} atoms

or,            = 2.408 \times 10^{23} atoms

Hence, we conclude that in 97.22 grams of Magnesium, there are 2.408 \times 10^{23} atoms.

7 0
1 month ago
7.744 Liters of nitrogen are contained in a container. Convert this amount to grams.
lorasvet [2795]

Answer:

9.69g

Explanation:

To find the needed outcome, we first need to determine the number of moles of N2 present in 7.744L of the gas.

1 mole of gas takes up 22.4L at STP.

Thus, X moles of nitrogen gas (N2) will fill 7.744L, meaning

X moles of N2 = 7.744/22.4 = 0.346 moles

Next, we will convert 0.346 moles of N2 to grams to achieve the result sought. The calculation goes as follows:

Molar Mass of N2 = 2x14 = 28g/mol

Number of moles N2 = 0.346 moles

Find the mass of N2 =?

Mass = number of moles × molar mass

Mass of N2 = 0.346 × 28

Mass of N2 = 9.69g

Hence, 7.744L of N2 consists of 9.69g of N2

7 0
2 months ago
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