Answer:
a
Explanation:
its formed from sodium and sodium metal is produced by electrolysis of dry molten sodium chloride.
Answer:
1.00 mole of He have 
atoms.
Explanation:
To solve this exercise it is important to know the definition of Avogadro's number
Avogadro's number is the proportional factor that relates the molar mass of a substance to the number of elementary units (atoms, molecules, particles, ions, electrons) that constitute it and its magnitude is equal to 6.022 140 857 × 10²³
One mole of helium we have atoms.
That means that one mole of sulfur has a mass of 32.065 grams. b) This compound contains two hydrogen atoms and one oxygen atom. To find the molar mass of H2O, we need to add the mass of two hydrogen atoms plus the mass of one oxygen atom. We get: 2(1.008)+16.00=18.016g/mol.
Answer:
13
Explanation:
Total force of friction between the box and the floor = 400 N
Force each student can apply = 32 N
Let the number of students required be x.
So, students required to make the box start moving
= 400 N < 32xN
= 400N/32N < x
= 12.5 < x
So, more than 12.5 students will be required. Since 12.5 students is not physically possible, so we will take the nearest whole number that is greater than 12.5, i.e, 13. So, 13 students will be required to shove the box.
