General Chemistry Answers

For this lab we had 9 trials

flask 1 solution 100 mL of 0.200 M KI made from a stock solution of KI that is 2.00M

flask 2 solution 100 mL of 0.100 M (NH4)2S2O8 made from a stock solution of (NH4)2S2O8 that is 1.00 M

given 100 mL of 0.0050 M Na2S2O3 (timing reagent)

50 mL of 0.20 M KCl

starch solution

experiment 1

flask 1

7.50 mL of 0.200 M KI

5.00 mL 0.00060 M S2O32-

one drop starch solution

add all listed above to one flask 1

determine the concentration of KI , (NH4)2S2O8,and Na2S2O3 when flask 1 and 2 are mixed together . The total volume for each reaction is 20.0 mL

You and 10 close friends finally got your permit for a private rafting trip down the Colorado River in the Grand Canyon !! Because you plan to do the entire stretch of river ( 350 km you'll need to travel an average of 17.5 km per day in order to be at the take - out after 20 days of rafting . If each person on your trip will be eating about 1.5 kg of food each day , what is the weight of all the food you'll be packing for the trip ?

What will be the value of the universal gas constant if pressure in kPa and volume is in liters?

What is the mass of (4.9x10^24) formula units of sodium chloride?

A 122.74 g of FeSO4•xH2O contains 77.04 g of FeSO4, calculate the percent by mass of water in the hydrate and record the value of x in the short answer box.

How many molecules of carbon dioxide are present in a sample of (4.1x10^2) moles?

How many moles are present in (4x10^1) g of tin (IV) oxide?

how many moles of PCl₅ can be produced from 50.0 g of Cl₂

Why are some of the planets in our Solar system small and rocky whiles others are large, gaseous and icy? 

hydrochloric acid is given below.

M2CO3 + 2HCl 2MCl + CO2 + H2O

0.245g of M2CO3 was found to exactly neutralise 23.6cm3 of hydrochloric acid of concentration

of 0.150moldm-3. Carry out the following calculations and hence deduce the identity of M.

i. Calculate the number of moles of hydrochloric acid. [2 marks]

ii. Calculate the number of moles of M2CO3. [2 marks]

iii. Calculate the relative molecular mass of M2CO3. [2 marks]

iv. Calculate the relative atomic mass of the metal M and hence deduce its identity. [