Answer:
R=0·083 J/mol·K
Explanation:
Ideal gas equation is
<h3>P×V = n×R×T</h3>
where,
P is the pressure of the gas
V is the volume of the gas
n is the number of moles of the gas
R is ideal gas constant
T is the temperature of the gas in Kelvin
In case of given problem
Temperature of the gas = 273+2·00=275·00K
P=259,392·00× atm
(259,392·00× )×8·8 = 1×R×275·00
∴R=0·0830 J/mol·K
But according to the rules of significant figures the value of R must be with least precision of all the values of the other parameters from which the value of R is calculated
Here the least precision is in the volume as it contains only 2 significant digits
∴ Value of R must contain 2 significant digits
∴ R=0·083 J/mol·K
Answer:
0.5475 grams of stomach acid, HCl, are neutralized by one tablet of Tums.
Explanation:
Mass of calcium carbonate = 750.0 mg = 0.750 g
Moles of calcium carbonate =
According to reaction , 1 mole of calcium carbonate reacts with 2 moles pf HCl.
Then 0.0075 moles of calcium carbonate will recat with:
of HCl.
Mass of 0.015 mol of HCl:
0.015 mol × 36.5 g/mol = 0.5475 g
0.5475 grams of stomach acid, HCl, are neutralized by one tablet of Tums.
There is little fundamental difference between "natural" fuels such as wood and fossil fuels such ascoal and oil. Both contain the same combustible substances essential oils and body fats from dead plants and animals.
Removing salt from water will reduce it's density
Answer:
Explanation:
We can write the amount of mass of radon-222 left after a time t by using the equation:
where
is the initial mass
t is the time
is the half-life
Substituting t = 15.2 d in the formula, we find