A compound contains 26.41 % Na, 36.84 % S, and 36.76 % O by mass. Calculate the empirical formula. 

In the molecule with a general formula XeF_n, identify "n" if 7.67 x 10²¹ molecules of XeF_n weighs 2.639 g

Find the molar mass of strontium nitrate (Sr(NO₃)₂), a red colorant.

Calculate the molar mass of each of the following compounds:

i) Co(ClO)₂

ii) N₂S₅

iii) Cu(ClO₃)₂

The most commonly utilized fertilizer in the world is diammonium phosphate (DAP), (NH₄)₂HPO₄. It is an excellent source of phosphorus and nitrogen. Determine the number of formula units present in 0.148 moles of DAP.

Refer to the molecular models shown below (gray = carbon, white = hydrogen, red = oxygen, yellow-green = fluorine). Calculate the number of moles present in 15.0 g of each compound.

A person weighing 72 kg has 7.4 × 10⁻³ mol of hemoglobin in their blood. Calculate the number of hemoglobin molecules and its mass in grams given that the molar mass of hemoglobin is 64,456 g/mol.

Arrange the compounds below in increasing mass % N

(NH₄)₃PO₄

(NH₄)₂SO₄

(NH₄)₂HPO₄

NaNO₃

NH₄NO₃

NH₃

Lactose in dairy food is converted solely into lactic acid in a process called homolactic fermentation. 

C₁₂H₂₂O₁₁ + H₂O → 4 C₃H₆O₃ 

Given that the density of lactic acid is 1.21 g/cm³, calculate the volume (in quarts) of lactic acid that can be produced when 50.0 lb of lactose is fermented (1 lb = 454 g; 1 L = 1.057 quarts).