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deff fn [24]
2 years ago
5

The atomic mass unit is presently based on assigning an exact integral mass (in amu) to an isotope of an hydrogen oxygen sodium

carbon helium
a. hydrogen

b. oxygen

c. sodium

d. carbon

e. helium
Chemistry
2 answers:
Stels [109]2 years ago
7 0

Carbon is the reference taken to assign the atomic mass unit

  • One twelfth of the mass of unbound carbon-12 is taken as 1amu
  • The unit for the atomic mass constant is Dalton (Da)
  • This unit is standard when doing calculations in chemistry and physics
  • 1amu = 1.6605x10⁻¹⁹g
  • This was also derived from the law of definite proportions
  • This standard has been set by the International Union of Pure and Applied Chemistry (IUPAC)
  • The IUPAC is responsible for assigning various standards such as the nomenclature of various compounds, and updating the periodic table of elements.
  • According to the IUPAC carbon is the reference taken to assign the atomic mass unit

Learn more about atomic mass units here:

brainly.com/question/338808

#SPJ10

GrogVix [38]2 years ago
4 0

Answer: a. hydrogen

This is a fact.

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A gas mixture with a total pressure of 745 mmHg contains each of the following gases at the indicated partial pressures: CO2, 12
Serhud [2]

Answer:

P_{He}=219mmHg

m_{He}=0.618gHe

Explanation:

Hello,

By applying the Dalton's law, we can compute the partial pressure of the helium has:

P_{tot}=P_{CO_2}+P_{Ar}+P_{O_2}+P_{He}

Now, solving for the partial pressure of the helium gas we get:

P_{He}=P_{tot}-P_{CO_2}-P_{Ar}-P_{O_2}=745mmHg-125mmHg-214mmHg-187mmHg\\P_{He}=219mmHg=0.288atm

On the other hand, the mass of the helium gas is computed via the ideal gas equation in terms of the helium's mass:

PV=\frac{m_{He}}{M_{He}}RT\\m_{He}=\frac{M_{He}PV}{RT} =\frac{4g/mol*0.288atm*12L}{0.082\frac{atm*L}{mol*K}*273K}\\ m_{He}=0.618gHe

Best regards.

7 0
3 years ago
Select True or False: Consider the reaction N2(g) 3H2(g) 2NH3(g). The production of ammonia is an exothermic reaction. When heat
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Answer:

False

Explanation:

As I like to think of it, equilibrium will shift either 'forwards' (to increase products) or 'backwards' (to increase reactants) to oppose any change in system;

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So the equilibrium will shift in this direction, which is the reaction of 2 NH₃ molecules producing N₂ and 3 H₂

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2 years ago
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