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The student did another experiment using 20 cm3 of sodium hydroxide solution with a concentration of 0.18 mol/dm3 . Relative formula mass (Mr) of NaOH = 40 Calculate the mass of sodium hydroxide in 20 cm3 of this solution.

Answer= 0.144g Working out: mol= conc x volume (in dm^3)mass = mol x RFFSo,mol = 0.18 x (20/1000) = 0.0036mol Mass= 0.036 x 40 = 0.144g
CI
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Assuming 100% yield, calculate the maximum volume of ammonia that could be produced from 1200dm3 of hydrogen, measured at room temp and pressure.

Okay so first always write out the equation...N 2 (g) + 3H 2 (g) ⇌ 2NH 3 (g)Now we need to ask ourselves what equations we know are relevant to the question. The question gives us a volume and states the con...
EB
Answered by Emma B. • Chemistry tutor
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The student did another experiment using 20 cm3 of sodium hydroxide solution with a concentration of 0.18 mol/dm3 . Relative formula mass (Mr) of NaOH = 40 Calculate the mass of sodium hydroxide in 20 cm3 of this solution.

20/1000 *0.18 final answer 0.144 Answer must be explained in person. It is very difficult to explain in writing.
SG
Answered by Saranya G. • Chemistry tutor
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A compound is found to contain 3.1% Hydrogen, 65.3% Oxygen and 31.6% Phosphorus. Work out its empirical formula.

To answer this question, we need to know the relative number of atoms of each element present. This can be calculated by dividing the amount of an element present in the sample by the relative masses of that...
AB
Answered by Adam B. • Chemistry tutor
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Describe the structure of the periodic table

The elements in the periodic table are arranged in terms of atomic number. i.e. hydrogen is first as it has 1 proton, then helium with 2, lithium with 3 etc.Elements in the same group have the same number of...
CW
Answered by Charles W. • Chemistry tutor
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