In order to know the number of moles from the given mass, the conversion factor to be used is the average atomic mass of Calcium which is equal to 40.08 g/mol. But first, let's convert mass from grams to kilograms knowing that there are 1,000 g in every 1 kg.
Mass = 351 kg * 1,000g/1 kg = 351,000 grams
Number of moles = 351,000 g * 1 mol/40.08 g = 8,757.5 moles Calcium
Answer:
through process of diffusion
Explanation:
air particles and odours move freely in all directions and eventually spreads out thus reaching the sitting room
Answer: 3.48 kJ of heat is released when 155.0 mL of 0.400 M HCl is mixed with 157.0 mL of 0.500 M NaOH
Explanation:
To calculate the number of moles for given molarity, we use the equation:
.....(1)
Molarity of solution = 0.400 M
Volume of solution = 155.5 mL
Putting values in equation 1, we get:
a)
b)
According to stoichiometry;
1 mole of reacts with 1 mole of
Thus 0.0622 moles of reacts with= moles of
Thus HCl is the limitibg reagent and NaOH is in excess
1 mole of HCl gives = 56 kJ
Thus 0.0622 moles of HCl gives =
Thus 3.48 kJ of heat is released when 155.0 mL of 0.400 M HCl is mixed with 157.0 mL of 0.500 M NaOH