Quantitative chemistry

Question 1

what’s the equation for the percentage mass of an element in a compound

Answer 1

percentage mass of an element in a compound = ((atomic number x number of atoms of that element) / relative formula mass of the compound) x 100

Question 2

what is the equation for moles

Answer 2

Number of moles = mass in grams / relative formula mass

Question 3

Why is the number for Avogadro’s constant so odd

Answer 3

the mass of that many atoms or molecules of any substance is exactly the same number of grams as the relative formula mass

Question 4

What is Avogadro’s constant?

Answer 4

6.02x10²³

Question 5

Equation for volume of gas

Answer 5

volume of gas = mass of gas / relative formula mass of gas

Question 6

equation for number of moles

Answer 6

number of moles = concentration x volume

Question 7

atom economy

Answer 7

atom economy = (relative formula mass of desired product / relative formula mass) x 100

Question 8

percentage yield

Answer 8

percentage yield = (mass of product made / maximum theoretical mass of product) x 100