What steps are needed to calculate the number of atoms of H in 5.00 g of CH4

Question

What steps are needed to calculate the number of atoms of H in 5.00 g of CH4

Answer 1

Step 1: find molar mass of CH4

Step 2: find moles of CH4 in 5.00 g of CH4

Step 3: find molecules of CH4 in 5.00 g CH4

Step 4: find atoms of H in 5.00 g CH4

Step 1: find molar mass of CH4

molar mass CH4 = 12 + 4(1) = 12 + 4 = 16 g / mole

Step 2: find moles of CH4 in 5.00 g of CH4

5.00 g CH4 x 1 mol / 16 g = 0.3125 moles CH4

Step 3: find molecules of CH4 in 5.00 g CH4

0.3125 moles CH4 x 6.022x10²³ molecules / mole = 1.88x10²³ molecules of CH4

Step 4: find atoms of H in 5.00 g CH4:

1.88x10²³ molecules CH4 x 4 H atoms / molecule = 7.53x10²³ H atoms