In the reaction Mg (s) + 2HCl (aq) H2 (g) + MgCl2 (aq), how many grams of hydrogen gas will be produced from 125.0 milliliters of a 6.0 M HCl in an excess of Mg
Answers
Since the Mg is in excess, therefore HCl will be fully consumed in the reaction.
The first step is to find the amount of HCl in mol
Let N (HCl) = amount of HCl in mol
N (HCl) = (6 mol HCL/L solution) *( 125 mL ) * (1 L/1000 mL) = 0.75 mol of HCl
Through stoichiometry
N (H2) = 0.75 mol HCl * (1 mol H2/ 2 mol of HCl)
N(H2) = 0.375 mol H2
Since we are asked for the number of grams of H2 (mass), we multiply this with the molar mass of hydrogen
M (H2) = 0.375 mol H2 ( 2 g H2 / 1 mol H2)
M (H2) = 0.75 g H2
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Find the mistake Cu(NO3)2(s) + CuO(s) → 2NO(g) + O3(g)
It is common for students to overshoot the endpoint, meaning they add too much NaOH(aq) from the buret, which causes the solution to turn bright pink. What specific impact does this mistake have on the percent of acetic acid result?
Answers
Answer:
CO₂
Explanation:
The product of the reaction is CO₂.
In a chemical reaction, the product is the substance usually found on the right hand side of the expression.
Reaction equation is given as;
C + O₂ → CO₂
In this reaction, C and O₂ are the reactants
CO₂ is the product of the reaction.
- This reaction is called a combination reaction in which two species combines to give a product.
Answers
Answer : The mass percentage of carbon in sucrose is, 42.1 %
Explanation: Given,
Molar mass of C = 12 g/mole
Molar mass of H = 1 g/mole
Molar mass of O = 16 g/mole
First we have to calculate the molar mass of sucrose.
Molar mass of sucrose =
Now we have to calculate the mass of carbon in 5 g of sucrose.
As we now that there are 12 number of carbon atoms, 22 number of hydrogen atoms and 11 number of oxygen atoms.
The mass of carbon =
As, 342 g of sucrose contains 144 g of carbon
So, 5 g of sucrose contains of carbon
Now we have to calculate the mass percentage of carbon in sucrose.
Formula used :
Now put all the given values in this formula, we get:
Therefore, the mass percentage of carbon in sucrose is, 42.1 %
18) 20 . 0.5150
19) 6,50% because (as you said) the law of definite proportions states that regardless of the amount, a compound is always composed of the same elements in the same proportion by mass
Answers
g g
-------------
G Gg | Gg
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G Gg | Gg
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The punnet square shows that all of the offspring are hererozygus. The dominant trait which is green will be shown over the recessive trait which is yellow.
100% of the offspring should have green pods.
Genotype
100% heterozygus (different) Gg
Phenotype
100% green
Answer:
d
Explanation:
Because all 500 of the offspring will have the dominant (G) allele, so all 500 will be green.
Answers
Answer: Plasma
Explanation:
There are four states of matter
Solid state : It is a state in which the particles are closely packed and does not have any space between them. This state has a definite shape and volume.
Liquid state : It is a state in which the particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another. This state has a definite volume but does not have a fixed shape.
Gaseous state : It is a state in which the particles are loosely arranged and have a lot of space between them.This state has indefinite volume as well as shape.
Plasma is the state of matter in which the gas is present in ionized form and is at high temperatures. Thus due to the presence of charged particles, they allow electric current to pass through them and are good conductors of electricity.
What is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid?
5.05 g
10.1 g
182 g
682 g
Answers
Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g)
We are given the amount of the reactant zinc to be used in the reaction This amount would be the starting point for the calculation. It is as follows:
5.00 mol Zn ( 1 mol H2 / 1 mol Zn ) (2.02 g H2 / 1 mol H2 ) = 10.1 g H2
Therefore, the correct answer is the second option.
Answer:
B. 10.1g
Explanation: