Answer:
204.7 g
Explanation:
(taking the atomic mass of C, H, O as 12, 1 and 16 respectively).
no. of moles of C3H8 burnt = 56.3 / (12x3 + 1x8)
= 1.27955 mol
From the equation, the mole ratio of C3H8 : O2 = 1:5
Hence,
the no. of moles of O2 required will be
=1.27955 x 5
= 6.397727 mol
Mass of O2 required = 6.397727 x (16x2)
= 204.7 g
Answer :
(a) The average rate will be:
(b) The average rate will be:
Explanation :
The general rate of reaction is,
Rate of reaction : It is defined as the change in the concentration of any one of the reactants or products per unit time.
The expression for rate of reaction will be :
From this we conclude that,
In the rate of reaction, A and B are the reactants and C and D are the products.
a, b, c and d are the stoichiometric coefficient of A, B, C and D respectively.
The negative sign along with the reactant terms is used simply to show that the concentration of the reactant is decreasing and positive sign along with the product terms is used simply to show that the concentration of the product is increasing.
The given rate of reaction is,
The expression for rate of reaction :
Thus, the rate of reaction will be:
<u>Part (a) :</u>
<u>Given:</u>
As,
and,
<u>Part (b) :</u>
<u>Given:</u>
As,
and,
Answer:
heat energy is released into the surrounding
Answer:
Salt issolved in water: homogeneous mixture
muddy water : heterogeneous mixture
Sodium fluoride = compound
Silver = element
Explanation:
Step 1:
A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.
A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture.
A chemical compound is a chemical substance consisting of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition.
An element is a substance whose atoms all have the same number of protons: another way of saying this is that all of a particular element's atoms have the same atomic number. Elements cannot be broken down using chemical reactions.
Salt dissolved in water = Salt is soluble in water, which would give a homogeneous mixture
Muddy water = Muddy water, on the other hand is a heterogeneous mixture because mud can settle, leaving the mixture with much less mud at the top of the bucket than the bottom.
Sodium floride = a compound made of 2 elements: Sodium and fluoride
Silver = An element, it can be found on the period table.
Answer:
= 0.25 g MgSO4
Explanation:
0.10% implies that the solution will contain 0.1 g of magnesium sulfate, for every 100 mL of solution.
Therefore;
= 250 g × 0.1 g/100 mL
= 0.25 g MgSO4