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3 years ago

HELP ME PLEASEEE ILL MARk u the brainliest

Chemistry

2 answers:

Novay_Z [31]3 years ago

8 0

Answer:

3rd or 4th answer is correct

belka [17]3 years ago

5 0

OPTION B is the correct answer

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Hydrolamine ,NH2OH , is a reducing agent found in some film developing solutions. How many hydrogen atoms are in 1.80moles of hy

kolezko [41]

Answer:

number of hydrogen atom in 1.8 mole of NH2OH = $9.8\times 10^{22}$

Explanation:

percentage of hydrogen in NH2OH = mass of hydrogen / mass of whole molecule

= $\frac{3\times 1}{14+3+16}$ \times 100

= 9.09 percentage

therefore number of moles in 1.8 moles of hydroxy amine = $\frac{9.09}{100}\times 1.8$

= .16 moles of hydrogen

number of hydrogen atom = (number of moles )×(avagadro number)

= $9.8\times 10^{22}$ atoms of hydrogen

3 0

3 years ago

A WATER WAY CONTAINS 10.3 MILIGRAMS OF IMPURITY PER GALLON OF WATER.HOW MANY MICROGRAMS OF IMPURITY ARE PRESENT PER LITER OF WAT

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I Gallon = 3.785 L 1 Mg = 1 mg gallon 3.785L. 3. The recommended adult dose of Elixophyllin®, a drug used to treat asthma, is 6.00 mg/kg of body mass. Calculate the dose in milligrams for a 112 lb person. (o oo Kg | K9 6.oong 112 15 = 3 04.7 - 3 2.20515 2.20516 my k.

Hope this answer will help you.

6 0

2 years ago

In boyle's law, the initial volume of a gas is 120 ml at 256 kpa. what will be the volume if the pressure increases to 385 kpa?

Vinil7 [7]

<h3>Answer:</h3>

79.8 ml

<h3>Explanation:</h3>

Boyle's law describes the relationship between pressure and volume when the temperature is constant. For this question, I will be rounding to significant figures.

Boyle's Formula

When describing the relationship between pressure and volume, the formula $\displaystyle P_{1} V_{1}= P_{2} V_{2}$ . In this formula, $P_{1}V_{1}$ is the initial pressure and volume. On the other side, $P_{2} V_{2}$ is final pressure and volume. So, to find a missing variable you must plug in the values you are given.

Final Volume

Remember when solving this question to remain constant in your units. When we plug in the values we know we are given:

$256kPa*120mL=385kPa*V_{2} mL$

Now, we can multiply the left side

$30720kPa*mL=385kPa*V_{2} mL$

Finally, we can divide by 385 to isolate the final volume

$79.8mL=V_{2}$

This gives the final volume of 79.8mL.

7 0

2 years ago

If a substance can be physically separated into its components, is it a pure substance or a mixture?

Marizza181 [45]

I think its pure substance since you are breaking into its components. For example if you were to break the components of salt apart (NaCl) You will be left with sodium and chloride which are the pure elements of salt. Therefore i believe pure is the best answer.

4 0

3 years ago

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Select the definition that best describes a coenzyme. an inorganic ion that aids the biochemical function of a protein a molecul

Rasek [7]

Answer:

a inorganic ion that aids the biochemical function of a protein a molecule that has a catalytic biochemical function on a substrate an organic molecule that assists with a protein's catalytic function a molecule that is biochemically altered during a catalytic reaction

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3 years ago