Answer:
Mass of hydrogen needed = 10 g
29.22 gram of sodium are required
Explanation:
1 )Given data:
Mass of oxygen = 80.0 g
Mass of hydrogen needed = ?
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 80 g/ 32 g/mol
Number of moles = 2.5 mol
now we will compare the moles of oxygen and hydrogen.
O₂ : H₂
1 : 2
2.5 : 2× 2.5 = 5 mol
Mass of hydrogen:
Mass = number of moles × molar mass
Mass = 5 mol × 2 g/mol
Mass = 10 g
2 : Given data:
initial mass ration of chlorine and sodium react with each other = 1.54 g : 1.0 g
Mass of sodium required for 45 g of chlorine = ?
Solution:
Cl₂ : Na
1.54 : 1.0
45 : 1.0/1.54× 45 = 29.22 g
Thus, 29.22 gram of sodium are required.
Explanation:
“The isomers butane and methyl propane have the same molecular formula and different properties”, this is because structural isomers usually have different properties to their parent.
Answer:
Number of mole = 0.0342 mole of Boron
Explanation:
One mole of a substance is equal to 6.022 * 10^23 units of that substance.
According to the definition in chemistry, mole is defined as the mass of substance containing the same number of fundamental units.
To calculate the number of mole, we will use the formula
n = m/Mm
n = number of mole
m = number of mass
Mm = number of molar mass
Molar mass of boron = 10.811g/mol
Mass of boron = 3.70 * 10^-1g
Using the formula
n = m/Mm
n = 3.70 * 10^-1 / 10.811g/mol
n = 0.0342 mole
The mass % F in the metal fluoride that is formed is 60.64%
<u><em>calculation</em></u>
Step 1: calculate the mass of fluorine (F)
mass of F = mass of metal fluoride - mass of the metal
= 7.47 g - 2.94 g= 4.53 g
Step 2: calculate the % mass of F
Mass % of F = mass of F / mass of metal fluoride x 100
mass % of F is therefore = 4.53 g/ 7.47 x 100 = 60.64%