# Transcribed Image Text: 3.60 Calculate the mass percentage of each element in 2-propanol, represented by the following molecular model. 3.73 Putrescine,

Excerpt
438 mg is treated with oxalic acid, H2C204, to give calcium oxalate, CaC2O4. CaCO3(s) + H2C20a(aq) → CaC2Oa(s) + H20(1) + CO2(g) The mass of the calcium oxalate produced is 469 mg. What is the mass percentage of (ans: 83.6%) calcium carbonate in ts limestone?

Transcribed Image Text: 3.60 Calculate the mass percentage of each element in 2-propanol, represented by the
following molecular model.
3.73 Putrescine, a substance produced by
has the empirical formula C2H6N. Several determinations of molecular weight give values in
the range of 87 to 90 amu. Find the molecular formula of putrescine
decaying animals,
3.88 Using the following reaction (depicted using molecular models), large quantities of
ammonia are burned in the presence of a platinum catalyst to give nitric oxide, as the first
step in the preparation of nitric acid.
Suppose a vessel contains 5.5 g of ammonia, how many grams of oxygen are needed for a
complete reaction?
3.105 A sample of limestone (containing calcium carbonate, CaCO3) weigng 438 mg is
treated with oxalic acid, H2C204, to give calcium oxalate, CaC2O4.
CaCO3(s) + H2C20a(aq) → CaC2Oa(s) + H20(1) + CO2(g)
The mass of the calcium oxalate produced is 469 mg. What is the mass percentage of
(ans: 83.6%)
calcium carbonate in ts limestone?