The number of oxygen atoms in 20.18 grams of Al(NO3); is: O 1.712 x 1023 O 0.09474 5.135 x 1023 O 5.705 x 1022

1. The molecular formula for potassium hydrogen phthalate (abbreviated KHP) is C3H$O4K. What is the molar mass of KHP? Show all work with no rounding errors and have the final answer accurate to at least two decimal places.

4. A student conducted an experiment by heating BaCl₂ 2H₂O and reported the percent of water as 15.25%. Calculate the percent error (Hint: Use the calculated theoretical value).

Calculate the mass in grams of 3.00 x 1024 molecules of methanol. The chemical formula for methanol is CH,O. mass: + TOOLS X10

A 1.58 mole sample of a pure unknown substance has a density of 1.87 g/cm3. If the sample occupies a volume of 188. cm3, what is the identity of the substance in the samples? Element Molar Mass Cadmium 112.411 Francium 223.02 Barium 137.327 Terbium 158.925 Molybdenum 95.95 Terbium Molybdenum Cadmium Francium Barium

How do i Complete the following calculation? Determine the number of grams of Carbon in 3.14 x 1032 atoms of Carbon.

What is the mass of 1.89x10^23  atoms of chlorine?  grams What is the mass of 8.08x10^23 molecules of chlorine?  grams

Make the following conversions: 1. 62.13 kg of Al to moles 2. 0.0235 moles of sugar, C,H,,O,, to grams 22 3. 12.54 grams of Cu to atoms 4. 15.00 mL of water to moles (density of water = 0.998 g/ mL) %3D 5. 3.005 X 10 21 atoms of Zn to grams

Calculate the mass (in grams) of 4.54 × 1020 molecules of hydroxychloroquine, C18H26ClN3O. Report your answer to 4 decimal places.

The chemical formula for potassium bromide is KBr. A chemist determined by measurements that 0.070 moles of potassium bromide participate in a chemical reaction. Calculate the mass of potassium bromide that participates. Round your answer to 2 significant digits.