Chemistry Answers

c) One pack of chips weighing 140 g contains 2.5% salt. Decide if Barborka was right that by eating two such packs of chips, the 65-kilogram Samo would exceed the recommended daily dose of salt.  (The recommended daily dose is 100 mg per 1 kg body weight)

Potassium iodate is most often used to iodide table salt. The weight fraction of potassium iodate in table salt is 0.006%. 0.59 g of iodine is contained in 1.00 g of potassium iodate. 

e) Calculate how much g of salt Samo needs to eat to cover his daily iodine requirement. Assume that Samo does not receive iodine from other sources, only through iodized table salt.

What is wootz iron? How it is produced

how many moles of atoms are in 3,011*10^23 atoms mg

Examine the importance and impact of isomerism in

industry – research case studies in order to consider the

formation of different isomers during manufacture, how

their presence may influence the industrial process, the

differences in properties that they might have, and the

possible consequences of ignoring the presence of

isomerism.

Given the following volumes of gases at 54.0°C and 790 torr, calculate the number of moles and the mass of a 150.0 mL Xenon gas

The equation for a reaction that can be used to manufacture lithium carbonate is

2Li2O2 + 2CO2 → 2Li2CO3 + O2

What is the atom economy for this reaction?

The equation for a reaction that can be used to manufacture lithium carbonate is

2Li2O2 + 2CO2 → 2Li2CO3 + O2

What is the atom economy for this reaction?

Calculate the root-mean-square speed of molecular chlorine in m/s at 20^oC.

1.     Find the enthalpy change for the reaction       (5 points)

         CS_{2 (l)}  + 3 O_{2 (g)} → CO_{2 (g)}  + 2 SO_2(g)      

When:   C(s) + O_2(g) → CO_{2 (g)}             

                       S_(s) + O_{2 (g)} → SO_2(g)              

               C_(s) + 2S(s) → CS_2(l)       

How would you prepare 4.00 x 10² mL of a 0.688 M NaOH solution, starting with a 5.70M stock solution? (2 points)