Answer:
Rate of hydrogen formation is 0.05 mole per second
Explanation:
Firstly, we write the equation of reaction.
When alkali earth metals react with dilute mineral acid, the reaction is vigorous with the production or evolution of hydrogen gas as a result of the displacement of the hydrogen from the acid by the metal. This is one of the basic reactions of mineral acids
Ca + H2SO4 ——> CaSO4 + H2
Looking at the reaction, 1 mole of calcium gave 1 mole of the hydrogen gas
What we do now is to calculate the number of moles of calcium produced by 20g of Ca
Mathematically;
number of moles = mass/atomic mass
number of moles of calcium is thus
20/40 = 0.5 moles
Now, if 1 mole of calcium produced 1 mole of the gas
Definitely, 0.5 mole of calcium will produce 0.5 mole of the gas
So the rate of gas formation would be 0.5/10 = 0.05 mole/second
Answer:
B
Explanation:
weight , w= mg where m is the mass of the object (unit is kg ) and g is the gravitational force acting on the object ( unit is m/s^2 )
hope it helps
The answer would be: carbon dioxide(CO2) and water (H2O).
The combustion of methane gas family typically will result in carbon dioxide and water. It will need many oxygen gases to do the combustion. The reaction equation would be:
<span>C4H8(l) + 6O2(g) ==> 4CO2 + 4H2O</span>
<em>Answer :</em> C - 1.02 x 10²³
<em>Explanation ;</em>
1 molecule of Al(NO₃)₃ has 3 N atoms.
Al(NO₃)₃ → Al + 3N + 9O
Moles (mol) = Mass (g) / Molar mass (g/mol)
Mass of Al(NO₃)₃ = 12 g
Molar mass of Al(NO₃)₃ = (27 + 14 x 3 + 16 x 9) g/mol
= 213 g/mol
Mass of Al(NO₃)₃ = 12 g / 213 g/mol
= 0.0563 mol
The stoichiometric ratio between Al(NO₃)₃ compound and N atoms is 1 : 3.
Hence,
the moles of N atoms = moles of Al(NO₃)₃ x 3
= 0.0563 mol x 3
= 0.1689 mol
According to the Avogadro constant,
1 mol of substance = 6.02 x 10²³ particles
Hence, N atoms in the 12 g of Al(NO₃)₃ = 0.1689 mol x 6.02 x 10²³ mol⁻¹
= 1.016778 x 10²³
= 1.02 x 10²³
Answer:
Atoms of the reactant(s) must equal the atoms of the product(s).
Explanation:
According to the Law of Conservation, all atoms of the reactant(s) must equal the atoms of the product(s).
As a result, we need to balance chemical equations. We do this by adding in coefficients to the reactants and/or products. The compound(s) itself/themselves DOES NOT CHANGE.
