Chemistry Answers

Based on the World Health Organization (WHO), adult ages 11 and above are ONLY

allowed to intake no more than 6g of salt per day. Now, humans love to eat food with strong

taste thus we developed food seasonings. On average, an 8g pack of food seasoning

contains 22% salt (let us assume this is in the form of NaCl), with a serving option of 4g per

dish.

Calculate the equivalent number of moles of salt per serving?

Note: The molar mass of Sodium Chloride is 58.44 g/mol

A solution is prepared by dissolving 10.00 g sucrose (MM of sucrose = 343 g) in 50g of water. The volume of the resulting solution is 52 mL. Calculate the following

A. molarity

B. molality

C. mole fraction

predict the formula for the selenate ions

A buffer solution is prepared by dissolving 1.50 g each of benzoic acid, C7H6O2, and

sodium benzoate, NaC7H5O2, in 150.0 mL of solution. [Ka = 6.3 x 10-5] a. What is the pH of this buffer solution? b. Which buffer component must be added, and in what quantity, to change the buffer pH to 4.00? c. What quantity of 2.0 M NaOH or 2.0 M HCl must be added to the original buffer to change the pH to 4.00.

How much ethanol is produced from the starting material of 987.1 Grams of glucose?

When SO₂(g) reacts with O₂(g) according to the following reaction, 98.9 kJ of energy are evolved for each mole of SO₂(g) that reacts. Complete the following thermochemical equation.

• 2SO₂(g) + O₂(g)2SO₃(g)    H =  kJ

What are the freezing point and boiling point of a solution that contains 5 g glycerol (  and 20 mL of water? 

In most of my homework, I found that the number of relative atomic mass RAM is the same as the molar mass. So, I'd like to ask whether...

1. RAM and molar mass are the same thing?
2. If no, why do they appear alike all the time?
3. and what are the differences between them?

On analysis, a coal sample has the following composition by weight; C = 90%, O = 4%, S

= 0.5% and ash = 5%. Net calorific value was found to be 8,480 kcal/kg. Calculate the

percentage of hydrogen and gross calorific value of coal.

1. what happens if temperature increases?
2. Pressure decreased?
3. More hydrogen added?

N₂ +3H₂ gives 2NH₃

∆ H=-9.3.6 kJ