Answer:
H2SO4
Explanation:
Firstly,
2.056% hydrogen = 2.056g of H
32.69% Sulphur = 32.69g of S
65.26% oxygen = 65.26g of O
Next, we convert each mass into moles by dividing by their respective molar mass:
H = 1, S = 32, O = 16
H = 2.056/1 = 2.056mol
S = 32.69/32 = 1.021mol
O = 65.26/16 = 4.078mol
Next, we divide each mole value by the smallest mole value (1.021)
H = 2.056/1.021 = 2.01
S = 1.021/1.021 = 1
O = 4.078/1.021 = 3.99
Approximately the ratio of H to S to O is 2:1:4, hence, the empirical formula for H, S and O is H2SO4.
Answer:
List the known and unknown quantities and plan the problem. Change each percent abundance into decimal form by dividing by 100. Multiply this value by the atomic mass of that isotope. Add together for each isotope to get the average atomic mass
Explanation:
Answer:
its a heterogeneous mixture.
Explanation:
The heterogeneous mixture has a non-uniform composition and has two or more phases. It can be separated out physically.
A homogeneous mixture is a solid, liquid or gaseous mixture that has the same proportions of its components throughout any given sample. Conversely, a heterogeneous mixture has components in which proportions vary throughout the sample.
Examples of Heterogeneous Mixtures
Sugar and sand form a heterogeneous mixture. If you look closely, you can identify tiny sugar crystals and particles of sand. Ice cubes in cola form a heterogeneous mixture. The ice and soda are in two distinct phases of matter (solid and liquid).
<u>Answer:</u> The number of moles of sugar that is used are 0.055 moles.
<u>Explanation:</u>
We are given:
Mass of 1 mole of sugar = 342 g
Mass of sugar used = 19 g
So, by applying unitary method, we get:
342 grams of sugar is making 1 mole
So, 19 grams of sugar will make =
Hence, the number of moles of sugar that is used are 0.055 moles.
Answer:
3.10 L
Explanation:
<em>A reaction at 11.0°C evolves 133.mmol of boron trifluoride gas. Calculate the volume of boron trifluoride gas that is collected. You can assume the pressure in the room is exactly 1 atm. Round your answer to 3 significant digits.</em>
Step 1: Convert the temperature to the Kelvin scale
When working with gases, we must use the absolute temperature scale. We can convert the temperature from Celsius t Kelvin using the following expression.
K = °C + 273.15
K = 11.0°C + 273.15
K = 284.2 K
Step 2: Convert the amount of matter to moles
We will use the conversion factor 1 mol = 1000 mmol.
133 mmol × (1 mol/1000 mmol) = 0.133 mol
Step 3: Calculate the volume of boron trifluoride gas
We will use the ideal gas equation.
P × V = n × R × T
V = n × R × T / P
V = 0.133 mol × (0.0821 atm.L/mol.K) × 284.2 K / 1 atm
V = 3.10 L