Yes you need 1\4 cup of cornstarch
80.5%- The total mass of the compound is 18g (14.5 + 3.5) then divide the mass of magnesium by the total. easy way to remember is- (part/whole) x 100
Answer:
37.046 grams of oxygen gas were produced.
Explanation:
Moles of potassium chlorite =
According to reaction 2 moles of potassium chlorite gives 3 moles of oxygen gas.
Then 0.7718 moles of potassium chlorite will give:
of oxygen gas.
Mass of 1.1577 moles of oxygen gas:
1.1577 mol × 32 g/mol = 37.046 g
37.046 grams of oxygen gas were produced.
If the potassium atoms could be lined up in a row, it would take to make a 1.00 ft row of potassium atoms is 5.45 × 10⁻⁸.
Potassium atom is represented by K with atomic number 19. It is a silvery white metal.
Given,
Radius = 280pm = 280 × 10⁻¹²m
Diameter = 2radius = 560× 10⁻¹²m = 560pm
We know that,
1 feet = 0.305m
So, number of potassium atoms that fits into the row,
1 feet = 0.305/560 × 10⁻¹²
1 feet = 5.45 × 10⁻⁸
Hence, it takes 5.45 × 10⁻⁸ atoms of potassium to make a 1 feet row.
Learn more about Potassium here, brainly.com/question/13321031
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