If 1.85×10^–3 moles of a hormone weigh 0.581 grams, calculate the molar mass of the hormone.

Calculate the number of P atoms in 2.63 g of phosphorus pentabromide (PBr₅)

Calculate the mass in grams of Br 3.28 x 10²¹ molecules of PBr₅

At equilibrium, the following decomposition reaction has 2.38 g NaNO₃, 3.92 g NaNO₂, and 1.29 g O₂.

2 NaNO₃  (s) → 2 NaNO₂ (s) + O₂ (g)

How much in grams of NaNO₃ is there originally if it is the only substance at the start of the reaction?

Identify the number of Al, S, and O atoms in the coagulating agent aluminum sulfate (Al₂(SO₄)₃).

Choose from the following statements which are inconsistent with the implications and postulates of Dalton's atomic theory.

I. Two oxygen atoms combine with one nitrogen atom to form a molecule of nitrogen dioxide.

II. One lithium atom can have a mass of 6 amu while another can have a mass of 7 amu.

III. Atoms are the smallest particles of all matter.

IV. Atoms can be created. 

V. Atoms of a compound are fixed and cannot rearrange. 

Find the sulfur to fluorine ratio by mass in SF₂ given that NS₂ has a 2.29 ratio of sulfur to nitrigen and NF₃ has a 4.07 ratio of fluorine to nitrogen.

Calculate the charge-to-mass ratio in C/kg of an alpha particle, ⁴He²⁺, that has a mass of 4.00151 amu.

Phosphorous-32 is a radioactive isotope of phosphorous and undergoes a beta decay to yield sulfur-32. If the two isotopes are to be differentiated using a mass spectrometer, what should be the precision of the mass spectrometer that is able to differentiate between the two?

Select the correct empirical formula for a substance with 11.34 mol C, 11.34 mol H, and 5.67 mol O.

The empirical formula of a compound is C₁₀H₁₃NO. Provide the molecular formula for C₁₀H₁₃NO if its molar mass is 326.432 g/mol.

An unknown compound consists of C, H, and N. When 0.227 g of the compound is ignited, it gives off 0.6581 g of CO₂ and 0.1122 g of H₂O. Determine its empirical formula and molecular formula if its molar mass is 273.33

Tellurium forms similar compounds as sulfur. Give the name of the following ion formed by tellurium: TeO₃^2–.

Identify the names of the positive ions involved in each of the following compounds

A) MgO

B) K₂SO₄

C) NaBrO₄

D) Co(NO₃)₂

E) Mn(OH)₂

Provide the name and formula of the compound formed by magnesium and iodine.

Identify the formula of gallium nitrate pentahydrate

Identify which pairing is incorrect. 

a. HBr, hydrobromide acid

b. H₂CrO₄, chromic acid

c. H₂PO₃, phosphoric acid

d. HCl, hydrochloric acid

Label the types of molecules as the following

(i) Monoatomic element

(ii) Diatomic element

(iii) polyatomic element 

(iv) molecular compound

(v) ionic compound.

a) Chlorine

b) C₁₂H₂₂O₆ 

c) Copper

d) Oxygen

e) NH₄Cl

f) Argon

Balance the following chemical equation: Co(NO₃)₃(aq) + (NH₄)₂CO₃(aq) → Co₂(CO₃)₃(s) + NH₄NO₃(aq)

Rubidium metal reacts with iodine gas as described in the following equation:

2Rb(s) + I₂(g) → 2RbI(s)

Initially, the reaction mixture contains 45.2 g Rb and 92.3 g I₂. How many grams of the excess reactant remain after the reaction has occurred completely?

C₂H₅Cl is produced by the reaction of chlorine (Cl₂) and ethane (C₂H₆). However, minor products such as C₂H₄Cl₂, are also produced in minuscule amounts. This minor products reduce the yield of C₂H₅Cl

A) Assuming that only C₂H₅Cl and HCl is formed, calculate the theoretical yield when C₂H₅Cl when 172.8 g of C₂H₆ is reacted with 402.6 g of Cl₂

B) If the reaction produces 153 g of C₂H₅Cl, calculate the percent yield of C₂H₅Cl

Is H₃CCHCHCH₂CH₃ an alkane, alkene, or alkyne?