Answer:
I guess the answer is compound
Explanation:
Coz compound it is on there playing with me again Go ahead and paste it in the class
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
Sodium and potassium are most likely to have similar physical and also chemical properties. They are in the same family called Alkali metals. Both will have the same valence electrons and are both very reactive.
Answer:
The unit often used in chemistry and physics to measure energy, such as for work or electrical current, is the
✔ joule
. We can also use this unit, as we did in this lab, for measuring
✔ specific heat
. This is a property that is quantified by the energy needed per
✔ gram
of material to raise the temperature by one
✔ degree Celsius
. The unit for this measure is therefore
✔ J/g°C
