Answer:
Explanation:
We are asked to find the original volume of a gas given a change in temperature. Since pressure remains constant, we are only concerned with volume and temperature, so we use Charles's Law. This states the volume of a gas is directly proportional to the temperature. The formula for this law is:
The gas begins with a temperature of 450 Kelvin, but the volume is unknown.
The gas is cooled to 248.9 Kelvin and the gas occupies a volume of 103.4 liters.
Since we are solving for the original volume, we must isolate the variable V₁. It is being divided by 450 Kelvin. The inverse operation of division is multiplication, so we multiply both sides of the equation by 450 K.
The units of Kelvin cancel.
Round to the nearest hundredth. The 2 in the thousandths place tells us to leave the 4 in the hundredth place.
The original volume is approximately <u>186.94 liters</u> and <u>Choice A</u> is correct.
Wha t kind of variables
independent variables
dependent variables
controled variables
Answer:
(A) N4H6 (B) H2O (C) LiH (D) C12H26
Explanation:
The given compounds have been arranged from left to right in order of increasing percentage by mass of hydrogen.
The percent by mass of hydrogen can be calculated by mass of hydrogen in that compound divided by total mass of that compound and finally multiplying the result with 100 to obtain the required percentage.
Explanation:
Number of moles equal to the given mass divided by molar mass of the element or compound.
Mathematically, No. of moles =
The given mass is g and molar mass is 24.30 g/mol.
Therefore, calculate the number of moles as follows.
No. of moles =
=
= mol
= mol
or, = 2000 mol
Thus, we can conclude that g of Mg has 2000 moles.