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3 years ago

PLEASE ANSWER FAST THERE IS THE PHOTO

Chemistry

2 answers:

astra-53 [7]3 years ago

6 0

Convergent plate boundary

Sergeu [11.5K]3 years ago

4 0

Answer:

convergent

Explanation:

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1. What is the equality between mL and L?

Mice21 [21]

Answer:

1 liter (L) = 1000 milliliters (mL)

Explanation:

5 0

3 years ago

Atomic mass number of first 30 elements

dangina [55]

Answer:

Element Atomic Number Atomic Mass

Nickel 27 58.6934

Cobalt 28 58.9332

Copper 29 63.546

Zinc 30 65.39

Explanation:

4 0

4 years ago

The source of bitterness in dark chocolate is the compound theobromine, an alkaloid present in cocoa beans. In a sample of dark

spin [16.1K]

Answer: 193 mg of theobromine are present in the sample.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given molecules}}{\text {Avogadros number}}=\frac{6.45\times 10^{20}}{6.023\times 10^{23}}=1.07\times 10^{-3}moles$

1 mole of theobromine $(C_7H_8N_4O_2)$ weigh = 180 g

$1.07\times 10^{-3}moles$ of theobromine $(C_7H_8N_4O_2)$ weigh = $\frac{180}{1}\times 1.07\times 10^{-3}=0.193g=193mg$ (1g=1000mg)

193 mg of theobromine are present in the sample.

5 0

3 years ago

Calculate the mass of 1.33 mol of copper (II) sulphate

nikklg [1K]

Answer:

a) 13g

Explanation:

5 0

3 years ago

Determine the quantity of bromine atoms in 18.0g of HgBr2 (using factor label method)

Gnoma [55]

Considering the definition of molar mass and Avogadro's Number, the quantity of bromine atoms in 18.0g of HgBr₂ is 6.023×10²² atoms.

<h3>Definition of molar mass</h3>

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

<h3>Molar mass of HgBr₂</h3>

In this case, you know the molar mass of the elements is:

Hg= 200 g/mole
Br= 79.9 g/mole

So, the molar mass of the compound HgBr₂ is calculated as:

HgBr₂= 200 g/mole + 2×79.9 g/mole

Solving:

HgBr₂= 359.98 g/mole

Definition of Avogadro's Number

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

<h3>Quantity of bromine atoms in 18.0g of HgBr₂</h3>

Factor-label describes a technique to convert one quantity to another quantity. This method uses the fact that any number or expression can be multiplied by one without changing its value; this is, consists in multiply the value you are given, unit of measurement included, by the conversion factor in fraction form.

Finally, knowing that 2 moles of Br are present in 1 mole of HgBr₂, and considering the molar mass of HgBr₂ and the definition on Avogadro's number, the quantity of bromine atoms in 18.0g of HgBr₂ is calculated as:

$18 gr HgBr_{2}\frac{1 mole HgBr_{2}}{359.98 gHgBr_{2}} \frac{2 mole Br}{1 mole HgBr_{2} } \frac{6.023x10^{23}atoms Br }{1 mole Br} =6.023x10^{22}atoms$

In summary, the quantity of bromine atoms in 18.0g of HgBr₂ is 6.023×10²² atoms.

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molar mass:

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<u>brainly.com/question/7132033</u>

<u>brainly.com/question/17249726</u>

Avogadro's Number:

<u>brainly.com/question/11907018</u>

<u>brainly.com/question/1445383</u>

<u>brainly.com/question/1528951</u>

8 0

2 years ago