81.875 g of magnesium phosphate Mg₂(PO₄)₃
Explanation:
The chemical formula of magnesium phosphate is Mg₃(PO₄)₂.
molar mass of Mg₃(PO₄)₂ = atomic weight of Mg × 3 + atomic weight of P × 3 + atomic weight of O × 3 × 4
molar mass of Mg₃(PO₄)₂ = 24 × 3 + 31 × 2 + 16 × 2 × 4 = 262 g/mole
Knowing the molar mass of Mg₃(PO₄)₂, we devise the following reasoning:
if in 262 g of Mg₂(PO₄)₃ there are 48 g of Mg
then in X g of Mg₂(PO₄)₃ there are 15 g of Mg
X = (262 × 15) / 48 = 81.875 g of Mg₂(PO₄)₃
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Answer:
3 mm is equal to 1.547244 inches. To do the calculation, use our online calculator. In the box next to “millimeters”, type 39.3. Once you have entered the number, the calculator displays the results. Once you have taken note of the numbers, click the reset button if you want to make other conversions.
Answer:
A
Explanation:
The molecules in both metal and surrounding air will start moving slower because of the sudden decrease in environment tmeperature. The thermal energy around the metal plate decreases, also decreasing the kinetic energy.
Answer:
ΔS = -0.1076 kJ /kg*K
Explanation:
Step 1: Data given
Initial state = 0.8 m³/kg and 25 °C = 298.15 K
Final state = 0. 3³/kg and 287 °C = 560.15 K
Cv = 0.686 kJ/kg*K
Step 2: Calculate the average temperature
The average temperature = (25°C + 287 °C)/2 =156 °C ( = 429 K)
Step 3: Calculate the ΔS
ΔS =(Cv, average) * ln(T2/T1) + R*ln(V2/V1)
ΔS = 0.686 * ln(560.15/298.15) + 0.2598*ln( 0.1/0.8)
ΔS = -0.1076 kJ /kg*K
Answer:
One is hands on and one is watching
Explanation:
I just know my science
