Answer:
Explanation:
Since this problem is incomplete, let us give a simple explanation to solve it.
In any reaction, we always have reactants that are in short supply and those that are in excess.
A reactant in short supply in a reaction is called the limiting reagent. This reactant will usually determine the extent of the reaction. When it is used up, the reaction will stop and will not proceed further.
To solve for the limiting reagent, convert the given mass to number of moles. Always work with number of moles.
Then write the balanced reaction equation.
Compare the moles from the balanced equation to that obtained. The reacting specie that is lesser in proportion is the limiting reagent
To solve the second part;
Compare the number of moles of the limiting reactant to that of the product i.e H₂O;
Use this number of moles to find mass;
Mass of H₂O = number of moles x molar mass
1. molarity = (moles)/vol in litres
0.5=[(weight/40)*1000]/4
0.5 = weight/16
weight of NaOH = 8 grams
2. weight = 0.45*850*84/100 gms
molecular weight = 85m (not sure abt this)
Answer:
The volume of carbon dioxide gas generated 468 mL.
Explanation:
The percent by mass of bicarbonate in a certain Alka-Seltzer = 32.5%
Mass of tablet = 3.45 g
Mass of bicarbonate =
Moles of bicarbonate ion =
According to reaction, 1 mole of bicarbonate ion gives with 1 mole of carbon dioxide gas , then 0.01840 mole of bicarbonate ion will give:
of carbon dioxide gas
Moles of carbon dioxide gas n = 0.01840 mol
Pressure of the carbon dioxide gas = P = 1.00 atm
Temperature of the carbon dioxide gas = T = 37°C = 37+273 K=310 K
Volume of the carbon dioxide gas = V
(ideal gas equation)
1 L = 1000 mL
0.468 L =0.468 × 1000 mL = 468 mL
The volume of carbon dioxide gas generated 468 mL.
Answer:- 88 kPa.
Solution:- The level of mercury in the atmospheric arm that is the open arm is 83 mm. It indicates the gas pressure is 83 mm higher than the atmospheric pressure.
gas pressure = height of mercury level in open tube in mm + atmospheric pressure
Let's convert this 83 mm pressure to kpa since the atmospheric pressure is given in kPa and the answer is also asked to report in kPa.
mmHg is converted to atm first and then atm is converted to kpa.
760 mmHg = 1 atm
and 1 atm = 101.325 kPa
= 11 kPa
Atmospheric pressure is 76.9 kPa.
gas pressure = 11 kPa + 76.9 kPa
gas pressure = 87.9 kPa
If we think about sig figs rule then 87.9 should be round to 88 as in addition we go with least number of decimal places. 11 kPa does not have any decimal places and so the gas pressure is 88 kPa.
I’m not 100% sure but I think it’s C