Methanol (CH4O) is used in the production of many chemicals. Methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure. CO(g) + 2H2(g) ---> CH4O(g)

1) How many molecules of hydrogen are needed to produce 25.O g of CH4O?

2) How many molecules of carbon monoxide are needed to produce 25.O g of CH4O?

3) How many molecules of hydrogen are needed to produce 50.0 g of CH4O?



Zinc and Nitric acid react to form zinc nitrate, ammonium nitrate, and water.

4Zn(s) + 10HNO3(aq) ---> 4Zn(NO3)2(aq) + NH4NO3(aq) + 3H2O(l)

4) How many atoms of zinc react with 1.49 g HNO3?

5) Calculate the number of molecules of zinc that must react with an excess of HNO3 to form 29.1g NH4NO3.

City a and city b had two different temperatures on a particular day. on that day, four times the temperature of city a was 8â° c more than 3 times the temperature of city b. the temperature of city a minus twice the temperature of city b was â’3â° c. what was the temperature of city a and city b on that day? city a was 5â° c, and city b was 4â° c. city a was 3â° c, and city b was â’1â° c. city a was 8â° c, and city b was â’3â° c. city a was 5â° c, and city b was â’5â° c.

13. calculate the initial concentration (before precipitation) of carbonate ions after the addition of each 0.05 ml of solution b to the 1.00 l beaker of solution a. divide the work among group members and write the answers in the table in model 3. assume the volume change as solution b is added is negligible. 14. notice the initial concentrations of zn2+ - and cu2+ in the table in model 3. a. explain how these were obtained from the data in model 2. b. as solution b is added and precipitates form, do these initial concentrations change? 15. use the data in model 2 to indicate the presence of precipitate (either znco3 or cuco3) after each 0.05 ml addition of solution b in model 3. 16. use the initial concentrations of carbonate ions and zinc ions to calculate the reaction quotient, qsp for the zinc carbonate scenarios in model 3. divide the work among group members and write the answers in the table in model 3. 17. use the initial concentrations of carbonate ion and copper(ii) ions to calculate the qsp for the copper(ii) carbonate scenarios in model 3. divide the work among group members and write the answers in the table in model 3.

Using data from seismic waves, geologists have learned that earth’s interior is made up of several