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Alex787 [66]
3 years ago
9

How many moles of each element are in one mole of Be(OH)2?

Chemistry
2 answers:
REY [17]3 years ago
8 0
B. 1 mole of beryllium, 2 moles of oxygen, 2 moles of hydrogen
Papessa [141]3 years ago
4 0

How many moles of each element are in one mole of Be(OH)2?

1 mole of beryllium, 1 mole of oxygen, 2 moles of hydrogen

1 mole of beryllium, 2 moles of oxygen, 2 moles of hydrogen CORRECT ANSWER

2 moles of beryllium, 2 moles of oxygen, 2 moles of hydrogen

2 moles of beryllium, 1 mole of oxygen, 1 moles of hydrogen

I took the test and B) was correct

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There are 360 degrees in a circle. How many arcminutes will be in 86% of a circle?
Leokris [45]

Answer:

There are 18572.9 arcminutes in 86% of a circle.

Explanation:

The degrees in 86% of a circle is:

degrees = \frac{86}{100}*360 = 309.6 ^{\circ}

Now, we need to find the number of arcminutes in 309.6°:

arcminute = \frac{59.99 arcminute}{1 degree}*309.6 degrees = 18572.9

Therefore, there are 18572.9 arcminutes in 86% of a circle.

I hope it helps you!

3 0
3 years ago
What is the importance of measuring the age of fingerprints
ivanzaharov [21]

Answer: Measuring the age of fingerprints is important because it can help detectives on a crime.

With fingerprints you can find the criminals record. Which would lead to their eventual arrest and a solved case.

Explanation:

8 0
3 years ago
A lead mass is heated and placed in a foam cup caloriemeter containing 40.0mL of water at 17.0 C. The water reaches a temperatur
Mrrafil [7]

the Answer is             502 Joules

8 0
3 years ago
Which of the following numerical expressions gives the number of particles in 2.0 g of Ne?
mojhsa [17]

Answer:

Number of particles = 2.0 g*(6.0 x 10^23 particles/mol) / 20.18 g/mol

Option C is correct

Explanation:

Step 1: Data give

Mass of Ne = 2.0 grams

Molar mass of neon = 20.18 g/mol

Number of Avogadro = 6.0 *10^23 /mol

Step 2: Calculate number of moles of neon

Moles Ne = Mass of ne / Molar mass of ne

Moles Ne = 2.0 / 20.18 g/mol

Moles Ne = 0.099 moles

Step 3: Calculate nulber of particles

Number of particles = 6.022*10^23 / mol * 0.099 moles = 5.96 *10^22

Number of particles = 6.022*10^23 * (2.0g/ 20.18g/mol)

Number of particles = 2.0 g*(6.0 x 10^23 particles/mol) / 20.18 g/mol

Option C is correct

7 0
3 years ago
According to scientific evidence, earth’s earliest atmosphere lacked oxygen. Over time, oxygen was added to the atmosphere.
Marianna [84]
B.
The cynobacteria were already there without the oxygen, so that rules out A, and a lot of prokaryotes were anaerobic, so that rules out C. Finally, Photosynthesis does not require oxygen. Instead, Oxygen is a waste product of it. Therefore, it cannot be D. So, we are only left with B
Hoped this helped :D
4 0
3 years ago
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