A. Water can dissolve a wide variety of substances
Moles (mol) = mass (g) / molar mass (g/mol)
Mass of cysteine = 150 mg = 150 x 10⁻³ g
Molar mass of cysteine = 121.16 g/mol
Moles of cysteine = 150 x 10⁻³ g / 121.16 g/mol
= 1.238 x 10⁻³ mol
Cysteine has chemical formula as C₃H₇NO₂<span>S.
Hence, 1 mole of </span>C₃H₇NO₂S produces 7 moles of H atoms.
Hence, moles of H atoms present in the sample = 1.238 x 10⁻³ mol x 7
= 8.666 x 10⁻³ mol
According to the Avogadro's constant 1 mole of substance has 6.022 × 10²³ particles.
Hence,
number of H atoms in the sample = 8.666 x 10⁻³ mol x 6.022 × 10²³ mol
= 5.219 x 10²¹
Answer:
The attraction of the polar water molecules for other molecules
Explanation:
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.
