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2 years ago

How many atoms are there in 5.20 mil of hafnium. Please help due in 1hr

Chemistry

1 answer:

Levart [38]2 years ago

8 0

In 5.70 mol of Hafnium there are 34,326

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What are the four combination air masses that can develop?

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The 4 types of air masses are polar, tropical, continental and maritime. Their classification depends on their location where they are formed.

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3 years ago

The coolant in automobiles is often a 50/50 % by volume mixture of ethylene glycol, C2H6O2, and water. At 20°C, the density of e

Misha Larkins [42]

Explanation:

Let the volume of the solution be 100 ml.

As the volume of glycol = 50 = volume of water

Hence, the number of moles of glycol = $\frac{mass}{molar mass}$

= $\frac{density \times volume}{molar mass}$

= $\frac{1.1088 \times 50}{62 g/mol}$

= 0.894 mol

Hence, number of moles of water = $\frac{50 \times 0.998}{18}$

= 2.77

As glycol is dissolved in water.

So, the molality = $0.894 \times \frac{1000}{49.92}$

= 17.9

Therefore, the expected freezing point = $-1.86 \times 17.9$

= $-33.31^{o}C$

Thus, we can conclude that the expected freezing point is $-33.31^{o}C$ .

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3 years ago

As shown in the image above, the Earth's outermost layer is divided into several tectonic plates. Which of the following is true

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The answer is B.) Some plates move toward each other, while others move away from or alongside each other.

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3 years ago

You drop a rock weighing 23.2 g into a graduated cylinder that contains 55 mL. The level of the water rises to 62 mL. What is th

ra1l [238]

The density of the rock is 3.314g/mL

CALCULATE DENSITY:

According to this question, a rock weighs 23.2g. After dropping the rock into a graduated cylinder containing 55mL of water, the level changes to 62mL.

This means that the volume of the rock can be calculated as follows:

Volume of rock = 62mL - 55mL

Volume of rock = 7mL

Density can be calculated using the formula as follows:

Density = mass ÷ volume

Density = 23.2 ÷ 7

Density = 3.314g/mL

Therefore, the density of the rock is 3.314g/mL

Learn more: brainly.com/question/6034174?referrer=searchResults

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3 years ago

3. 79,789kJ = (293k) (377kJ)

KatRina [158]

the anwser would most likely be j=0

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3 years ago