Answer:
x=1.4*10^9
or choice a
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<u>True,</u> A mole of one substance has the same number of atoms as a mole of any other substance.
<h3>
What is a mole?</h3>
Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
The mole designates an extremely large number of units, 6.02214076 × . The General Conference on Weights and Measures defined the mole as this number for the International System of Units (SI) effective from May 20, 2019. The mole was previously defined as the number of atoms determined experimentally to be found in 12 grams of carbon-12.
The number of units in a mole also bears the name Avogadro’s number, or Avogadro’s constant, in honour of the Italian physicist Amedeo Avogadro (1776–1856). Avogadro proposed that equal volumes of gases under the same conditions contain the same number of molecules, a hypothesis that proved useful in determining atomic and molecular weights and which led to the concept of the mole.
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Friction would be the answer
Answer:
The active ingredients in baking soda (NaHCO3) are
and
when Baking soda reacts with Acetic acid
Molecular equation
NaHCO3(aq) + CH3COOH(aq) → Na(CH3COO)(aq) + CO2(g) +H2O(l)
Ionic equation
→
as is present on both sides so it will cancel out and the net ionic equation will be
→
Explanation:
1mM of solution means millimolar, that is 1 millimole of solute is contained in 1 liter of solvent.
Converting mM to M,
150mM to M = 150*1 x 10^-3
= 0.15M
Number of moles = molar concentration * volume
= 0.15*0.5
= 0.075 moles.
Molar mass of NaCl = 23 + 35.5
= 58.5 g/mol
Mass of NaCl = molar mass * number of moles
= 58.5*0.075
= 4.3875g
Description:
• 4.3875 g of NaCl is measured on a measuring scale and poured in a conical flask.
• 1 liter of solvent is measured with a measuring cylinder and poured into the conical flask and mixed.