<span>The key in
the balancing of chemical reaction is to make sure that you got the exact
chemical formula of the substance that is reacting and the yielded product.
After getting the formula, identify first the hardest element/atom to be
balanced such as Na, Zn, Cl, C, O, etc. Then proceed to the easier ones such as
O, H. Make sure to note the atoms present in the molecule of the substance. Among
the three equations, PCl2 + 4H2O --->H3PO4 + 5HCL is not balanced. The
hardest element here is the Cl. Observe that there are 5Cls in the product side
so you must add 5 to the PCl2. However, there are only 2Cl atoms and it needs
3 to balance the equation. Also, there is no P in the product side. This equation
is invalid.</span>
Helium. If you're talking about waves in the air.
Which atom?
Atomic mass - proton
Answer: Option (3) is the correct answer.
Explanation:
In an aqueous solution, a compound exists in the form of ions that is in the form of protons and electrons.
Protons are positively charged and electrons are negatively charged. A proton (usually hydrogen ion, ) in water (solvent) also exists as .
For example,
This shows that the conjugate acid of is .
Thus, we can conclude that a hydrogen ion, H+, in aqueous solution may also be written as .
Answer: 4.22 grams of solute is there in 278 ml of 0.038 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
where,
n = moles of solute
= volume of solution in L
Now put all the given values in the formula of molality, we get
mass of =
Thus 4.22 grams of solute is there in 278 ml of 0.038 M