Used mainly in the context of Geography a Constructive force is involved in making new land while a Destructive force breaks the land. As they are carrying opposite functions to one another they are considered as competing forces.
Answer:
60.02 g.
Explanation:
- It is clear from the balanced equation:
<em>Mg + 2HCl → MgCl₂ + H₂.
</em>
that 1.0 mole of Mg reacts with 2.0 moles of HCl to produce 1.0 mole of MgCl₂ and 1.0 moles of H₂.
- 20.0 g of Mg reacts with excess HCl. To calculate the no. of grams of HCl that reacted, we should calculate the no. of moles of Mg:
<em>no. of moles of Mg = mass/atomic mass</em> = (20.0 g)/(24.3 g/mol) = 0.823 mol.
- From the balanced equation; every 1.0 mol of Mg reacts with 2 moles of HCl.
∴ 0.833 mol of Mg will react with (2 x 0.833 mol = 1.646 mol) of HCl.
<em>∴ The mass of reacted HCl = no. of moles x molar mass</em> = (1.646 mol)(36.46 g/mol) = <em>60.02 g.</em>
Answer:
4.25g
Explanation:
Molar concentration or molarity can be calculated thus;
Molarity (M) = number of moles (n) ÷ volume (V)
According to the provided information in this question, Volume = 5.0L, M = 0.050 M
number of moles = molarity × volume
n = 0.050 × 5
n = 0.25moles
Number of moles in a substance = mass (M) ÷ molar mass (MM)
Molar mass of ammonia (NH3) = 14 + 1(3)
= 17g/mol
Mass = moles × molar mass
Mass (g) = 0.25 × 17
Mass = 4.25g
Answer:
In fact this should be considered more of a continuum. For example salt dissolving in water is usually considered to be a physical change, however the chemical species in salt solution (hydrated sodium and chlorine ions) are different from the species in solid salt.
Explanation:
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