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
I say the answer is The ratio of oxygen atoms to hydrogen atoms in a molecule of sugar is 2 to 1
The answer is (B) Applied. Applied sciences have a goal of using science for practical applications, like technology, curing diseases, and inventions. Basic sciences aim to expand knowledge for improved understanding or to explain phenomena. Two examples of basic sciences are using a microscope to observe a specimen and studying the human eye to learn how it works.
The correct answer would be:
D. Mixtures can be separated by physical means.
A scale is used to measure mass