Assuming that STP = 0°C, and 1 atm pressure:
molar volume is 22.414 L = 22 414 cm^3
75 mL = 1*75/22 414 moles = 0.0033461 moles.
mole mass = 39.9 g --->
0.0033461 moles = 0.0033461*39.9 g = 0.13351 g <--- ans.
Answer
a) Group 16
b) Group 1
c) Group 15
d)
e)
f) Sodium
g) Oxygen
h) Phosphorus
Procedure
Using the periodic table below identify the elements. The periodic table organizes elements in a way that reflects their number and pattern of electrons. The table places elements into columns—groups—and rows—periods.
An element’s column number gives information about its number of valence electrons and reactivity. In general, the number of valence electrons is the same within a column and increases from left to right within a row. Applies only for groups 1,2, 13-18 (remembering that from 13 to 18 the last number is the valence).
hope it helps ..............
Answer: d. Glaciers moving revealing bare rock underneath
Explanation:
Primary succession is what happens when living things colonise an area that was previously uncolonized because it had been destroyed or hadn't been created yet.
When glaciers move on from areas and expose the bare rock underneath, these areas are new and so primary succession will take place as living things begin to colonize this new area.
Answer:
-138.9 kJ/mol
Explanation:
Step 1: Convert 235.8°C to the Kelvin scale
We will use the following expression.
K = °C + 273.15 = 235.8°C + 273.15 = 509.0 K
Step 2: Calculate the standard enthalpy of reaction (ΔH°)
We will use the following expression.
ΔG° = ΔH° - T.ΔS°
ΔH° = ΔG° / T.ΔS°
ΔH° = (-936.92kJ/mol) / 509.0K × 0.51379 kJ/mol.K
ΔH° = -3.583 kJ (for 1 mole of balanced reaction)
Step 3: Convert -9.9°C to the Kelvin scale
K = °C + 273.15 = -9.9°C + 273.15 = 263.3 K
Step 4: Calculate ΔG° at 263.3 K
ΔG° = ΔH° - T.ΔS°
ΔG° = -3.583 kJ/mol - 263.3 K × 0.51379 kJ/mol.K
ΔG° = -138.9 kJ/mol