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Alla [95]
3 years ago
13

The two most abundant isotopes of boron are 10B and 11B, with 11B being about 4 times more abundant. In the mass spectrum of tri

methyl borate [(CH3O)3B], ________.
Chemistry
1 answer:
damaskus [11]3 years ago
7 0

The relative atomic mass of Boron in trimethyl borate [(CH3O)3B] is; 10.8

<h3>Isotopes and Relative abundance</h3>

According to the question;

  • Since, ¹¹B is 4 times more abundant than ¹⁰B;

The relative abundance of Boron in the spectrum is;

Relative atomic mass = (80% of 11) + (20% of 10)

  • RAM = 8.8 + 2

  • RAM = 10.8

Hence, the relative atomic mass of Boron in trimethyl borate [(CH3O)3B] is; 10.8

Read more on Isotopes;

brainly.com/question/14220416

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A sample of CO2 gas at 100 degrees Celsius has a volume of 250 mL at 760 mm Hg. How many moles of CO2 are present
Fed [463]

There are 8.16 × 10-³ moles of CO2 gas at 100°C with a volume of 250 mL at 760 mm Hg.

HOW TO CALCULATE NUMBER OF MOLES:

The number of moles of a sample of gas can be calculated using the following formula:

PV = nRT

Where;

  • P = pressure of gas (atm)
  • V = volume (L)
  • n = number of moles (mol)
  • R = gas law constant (0.0821 Latm/molK)
  • T = temperature (K)

According to this question;

  • P = 760mmHg = 1 atm
  • T = 100°C = 100 + 273 = 373K
  • V = 250mL = 0.250L
  • n = ?

1 × 0.250 = n × 0.0821 × 373

0.250 = 30.62n

n = 0.250 ÷ 30.62

n = 8.16 × 10-³mol

Therefore, there are 8.16 × 10-³ moles of CO2 gas at 100°C with a volume of 250 mL at 760 mm Hg.

Learn more about number of moles at: brainly.com/question/4147359

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What happens in a stationary front?
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c a cold air mass and a warm air mass meet with neither moving

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The sodium chloride molecule breaks apart in water. what does a represent
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What represent ???( the molecules get dissolved in water)..
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