Week 4 electron structure

How many hydrogen atoms are in 2.00 mol of CH₄?

• 4.82E24 H atoms

• 1.20E24 H atoms

• 6.02E23 H atoms

• 2.41E24 H atoms

Magnesium has three isotopes: Mg-24 (78.99% abundance, 23.985042 amu), Mg-25 (10.00% abundance,24.985837 amu), and Mg-26 (11.01% abundance, 25.982593 amu). Calculate the average atomic mass in amus. Enter only the number without units

How many hydrogen atoms are in 5.00 g of H₂O?

• 1.67E23 H atoms

• 6.02E23 H atoms

• 1.20E24 H atoms

• 2.41E24 H atoms

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula. Enter the formula without using superscripts. Ex H2O

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen? Enter the formula with out subscripts. Ex H2O

Name Al(NO₃)₃

Name FeCl₃

Name CuSO₄

Name Ca₃(PO₄)₂

Name PbO₂