Answer: 0.5 moles
Explanation:
Cr2(SO3)2 is the chemical formula for chromium sulphate.
Given that,
Amount of moles of Cr2(SO3)2 (n) = ?
Mass of Cr2(SO3)2 in grams = 128.9g
For molar mass of Cr2(SO3)2, use the atomic masses:
Chromium, Cr = 52g;
Sulphur, S = 32g;
Oxygen, O = 16g
Cr2(SO3)2 =
(52g x 2) + [(32g + 16g x 3) x 2]
= 104g + [(32g + 48g) x 2]
= 104g + [80g x 2]
= 104g + 160g
= 264g/mol
Since, n = mass in grams / molar mass
n = 128.9g / 264g/mol
n = 0.488 mole [Round the value of n to the nearest tenth which is 0.5
Thus, there are 0.5 moles in 128.9 grams of Cr2(SO3)2
There are many ways in which the periodic table is a valuable tool of science. It is a tabular arrangement of the known elements, with an order based on atomic number (i.e. number of protons) and a layout based on other properties including electron configuration and chemical properties.
By ordering the elements in this way, the periodic table allows generalisations (or predictions) to be made about elements simply by their proximity to other elements in the table; it shows elements with similar constitutions have similar chemical properties. It also serves as a concise way to categorize the elements together in one place, outlining known elements and those that may yet to be discovered. For example, the current period table groups elements from atomic number 1 (hydrogen) to atomic number 118 (organesson). Many of the elements at these extreme atomic numbers are unstable yet they still exist, and many more elements likely exist that we have yet to discover. The periodic table allows the reader to rapidly visualise the suite of known elements in a meaningful way, whilst exposing the limits of our current knowledge.
360.18 K is the Kelvin temperature to which 10.0 L of a gas at 27 °C would have to be heated to change the volume to 12.0 L.
Explanation:
Data given:
Initial volume of the gas, V1 = 10 litres
Initial temperature of the gas, T1 = 27° C or 273.15+27 = 300.15 K
Final volume of the gas obtained, V2 = 12 Litres
final temperature to obtain the above volume, T2 =?
temperature value in Kelvin
Applying Charles' Law to the data given,
rearranging the equation to get T2,
T2 =
Putting the values in the equation:
T2 =
T2 = 360.18 K
The gas will be heated at the temperature of 360.18 K to get its volume changed to 12 litres.
Answer:
E and B
Explanation:
the warmer the weather the faster it will decompose, this why is why sometimes bodies last longer frozen, or in cool temperatures.
that statement takes a out.
An illness shouldn't effect a decomposing body
Weight also shouldn't effect a decomposing body
Being buried can make bodies decompose fast because of all the bugs and other animals that will get down there and decompose it faster
Answer: B,E
Answer is: B. Water has a set of properties that are different from oxygen and hydrogen.
For example, boiling point of water is 100°C and oxygen has boiling point of -183°C and hydrogen has boiling point of -253°C.
Another example, at room temperature water is liquid, oxygen and hydrogen are gases.
Water is not flammable, hydrogen anf oxygen are flammable.
Water has polar covalent bonds, oxygen anf hydrogen have nonpolar bonds between atoms.