Answer:
0.0018 moles
Explanation:
Given data:
mass of aspirin= 0.325 g
molar mass of aspirin= 180.1589 g/mol
number of moles=?
Formula:
number of moles= mass in gram/ molar mass (g/mol)
Solution:
now we will put the values in given formula:
number of moles of aspirin= mass of aspirin/ molar mass of aspirin
number of moles= 0.325 g/ 180.1589 g/mol
number of moles = 0.0018 mol
Mole:
Mole is the unit of amount in chemistry. it is SI unit and represented by "mol".
Example;
one mole of hydrogen has a mass of 1.008 g and contain 6.022× 10∧23 atoms.
The answer is A. Two molecules of potassium chloride react with one molecule of lead nitrate to form two molecules of potassium nitrate and one molecule of lead chloride.
Answer: For the equilibrium that exists in an aqueous solution of nitrous acid (HNO2, a weak acid), the equilibrium constant expression is K = [ H+] [NO2-] / [HNO2].
Explanation:
An expression that depicts the ratio of products and reactants raised to the power of their coefficients at equilibrium is called equilibrium constant.
An equilibrium constant is denoted by the symbol 'K'.
For example, the dissociation of nitrous acid in aqueous solution is as follows.
Hence, its expression for equilibrium constant is as follows.
![K = \frac{[H^{+}][NO^{-}_{2}]}{[HNO_{2}]}](https://tex.z-dn.net/?f=K%20%3D%20%5Cfrac%7B%5BH%5E%7B%2B%7D%5D%5BNO%5E%7B-%7D_%7B2%7D%5D%7D%7B%5BHNO_%7B2%7D%5D%7D)
Thus, we can conclude that for the equilibrium that exists in an aqueous solution of nitrous acid (HNO2, a weak acid), the equilibrium constant expression is K = [ H+] [NO2-] / [HNO2].
Answer:
DNA consists of molecules called nucleotides. Each nucleotide comprises a group of phosphates, a group of sugars and a base of nitrogen. The four forms of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C). The sequence of these bases defines the DNA instructions or genetic code.
Non-polar Solute and Polar Solvent (and vice versa)
However the molecules in the solute and solvent are only able to make dispersion forces with each other (as they aren't both polar). This only releases very little energy. Therefore overall, more energy is required than released and hence the process won't happen.
