Remember that density refers to the "mass per unit volume" of an object.
So, if an object had a mass of 100 grams and a volume of 100 milliliters, the density would be 100 grams / 100 ml.
In the question, water on the surface of the scale would add weight, so the mass of the object that you're weighing would appear to be heavier than it really is. If that happens, you'll incorrectly assume that the density is GREATER than it really is
As an example, suppose that there was 5 ml of water on the surface of the scale. Water has a density of 1 gram per milliliter (1 g/ml) so the water would add 5 grams to the object's weight. If we use the example above, the mass of the object would seem to be 105 grams, rather than 100 grams. So, you would calculate:
density = mass / volume
density = 105 grams / 100 ml
density = 1.05 g/ml
The effect on density would be that it would erroneously appear to be greater
Hope this helps!
Good luck
Iodine- in most cleaning solutions
Answer: 0.0195g of CO2 is produced
Explanation:
CH4 + 2O2 —> CO2 + 2H2O
Molar Mass of CO2 = 12 + (16x2) = 12 + 32 = 44g/mol
Molar Mass of CH4 = 12 + (4x1) = 12 + 4 = 16g/mol
From the equation,
16g of CH4 produce 44g of CO2.
Therefore 7.10×10^−3 of CH4 will produce Xg of CO2 i.e
Xg of CO2 = (7.10×10^−3x44) /16 = 0.0195g
<span>Over a period of 6 hours, the substance went from 100% to about 60%, which is slightly less than one half life. One half life is therefore slightly more than 6 hours, with 7.4 hours being the most logical answer.</span>
i think..
potassium hydroxide..