Other Chemistry Answers

You come home from school and walk into a debate where participants cannot decide if CO2, a green smoothie, and Cl are a mixture, a compound, or an element. As a chemist, you know the right answer. Explain which category each substance falls under and how you arrived at that conclusion

100 grams of water was produced from the complete combustion of naphthalene (C10H8).

Calculate for the initial volume of the fuel in liters. Assume that it is stored in a container

under a pressure of 1 atm and a temperature of 25°C.

Mannitol is the product of the reaction of the reaction mannose with

3NO₂ + 1H₂O --> 2HNO₃

How many moles of water are needed to react with 8.4 moles of NO₂?

1. 12 HClO4 + P4O10 -> 4H3PO4 + 6 Cl2O7

given 5.48 mol HClO4, how many miles of H3PO4 could be produced (assuming abundant P4O10 is present)

1. 8 CO + 17 H2 -> C8H18 + 8 H2O

assuming an unlimited supply of hydrogen gas (H2), how many miles of C8H18 could be produced with 26.79 miles of carbon monoxide?

1. B2Br6 + 6HNO3 -> 2 B(NO3)3 + 6 HBr

given 276.2 g B2Br6, how many grams of HBr could be produced? assume you have more than enough HNO3

How many moles are in 3.26 x 10²³ atoms of Pb?

A sample of pure CaCO3 weighing 0.2428g is dissolved in HCl and the solution diluted to 250ml in a volumetric flask. A 50.00ml aliquot requires 42.74ml of an EDTA solution for titration. A 200ml sample of water containing Ca+2 is titrated with 16.38ml of the EDTA solution. Calculate the degree of hardness of water in ppm CaCO3. 

A 50.0ml sample of water containing both Ca+2 and Mg+2 is titrated with 16.54ml of 0.01104M EDTA in an ammonia buffer of pH 10. Another 50.0ml sample is treated with NaOH to precipitate the Mg(OH)2 and then titrated at pH 13 with 9.26ml of the same EDTA solution. Calculate the ppm each of CaCO3 and MgCO3 in the sample. 

A sample of pure CaCO3 weighing 0.3677g is dissolved in hydrochloric acid and the solution diluted to 250.0ml in a volumetric flask. A 25.00ml aliquot requires 30.26ml of an EDTA solution for titration. Calculate a) the molarity of the EDTA solution; b) the number of grams Na2H2Y•2H2O (FW = 372.2) required to prepare 500.0ml of the solution. 

Explain how to prepare 800 ml of 0.78 mmol/litre NAD+ (MW 655.43) solution.

Explain how to prepare 100 ml of 0.55 mmol/litre ATP (MW 555.14) solution.

Describe how you would prepare 400 ml of the following solution

Tris HCl buffer - 100 mmol/l (MW 157.6) containing

1 mmol/l magesium acetate           (MW 214.45)                      

0.78 mmol/l NAD+                            (MW 655.43)                      

0.55 mmol/l ATP                              (MW 555.14)