Explanation:
The dimensions of a standard backpack is 30cm x 30cm x 40cm
The mass of an average student is 70 kg
We know that, the density of gold is 19.3 g/cm³.
Let m be the mass of the backpack. So,
An average student has a mass of 70 kg. If we compare the mass of student and mass of backpack, we find that the backpack is 10 times of the mass of the student.
Answer:
Amount of sodium sulphate is 5.64g
Amount of water is 1.017g
Explanation:
First give a balanced equation for the reaction
2NaOH + H2SO4 > Na2SO4 + 2H2O
Find the number of moles of each reacting specie by dividing the mass by their molar mass
Use the number of moles to find the amount in the product
For 2NaOH
2.26/80=0.02825moles
0.02825 x molar mass of 2H2O = 1.017g
For H2SO4
4.19/98=0.0428moles
0.0428 x 132 = 5.64g
Always pay attention even the littlest thing can mess everything up