Answer:
One mole of SnO2
Explanation:
SnO2(s) + 2H2(g) ------> Sn(s) + 2H2O(l)
In every question that has to do with stoichiometry, the balanced reaction equation is the first step towards obtaining the correct answer because it serves as a guide in solving the question.
From the balanced reaction equation, we have
1 mole of SnO2 reacts with 2 moles of hydrogen gas to yield two moles of water.
The balanced reaction equation represents one mole of SnO2.
Hence the answer.
I believe that the best answer among the choices provided by the question is the third choice , a change in number
Hope my answer would be a great help for you. If you have more questions feel free to ask here at Brainly.
EMT (emergency medical transportation)
Answer:
The letters are a one- or two-letter symbol assigned to each. element. ... The letters represent the name of the element when it was. discovered
Explanation:
What do the letters in the boxes of the periodic table represent?
A. The letters stand for the names commonly used for the elements.
O
C. The letters are an abbreviation of the element's name in English.
O
n chemistry, a symbol is an abbreviation for a chemical element. Symbols for chemical elements normally consist of one or two letters from the Latin alphabet and are written with the first letter capitalised.
Earlier symbols for chemical elements stem from classical Latin and Greek vocabulary. For some elements, this is because the material was known in ancient times, while for others, the name is a more recent invention. For example, Pb is the symbol for lead (plumbum in Latin); Hg is the symbol for mercury (hydrargyrum in Greek); and He is the symbol for helium (a new Latin name) because helium was not known in ancient Roman times. Some symbols come from other sources, like W for tungsten (Wolfram in German) which was not known in Roman times.d
