Answer:
From least complex to most complex, the answer would be: cell - tissue – organ - system
1.
V = 200 mL (volume)
c = 3 M = 3 mol/L (concentration)
First we convert mL to L:
200 mL = 0.2 L
Then we calculate the moles using the formula: n = V × c = 0.2 L × 3 mol = 0.6 mol
Finally, we just use the molar mass of CaF2 to calculate the actual mass:
molar mass = 78 g/mol
The formula is: m = n × mm (mass = moles × molar mass)
m = 0.6 mol × 78 g/mol = 46.8 g
2.
For this question the steps are exactly like the first question.
V = 50mL = 0.05 L
c = 12 M = 12 mol/L
n = V × c = 0.05 L × 12 mol/L = 0.6 mol
molar mass (HCl) = 36.5 g/mol
m = n × mm = 0.6 mol × 36.5 g/mol = 21.9 g.
3.
The steps for this question are the opposite way.
m(K2CO3) = 250 g
molar mass = 138 g/mol
n = m ÷ mm = 1.81 mol
c = 2 mol/L
V = n ÷ c = 1.81 mol ÷ 2 mol/L = 0.905 L = 905 mL
Answer:
The partial pressure of oyxgen O2 is 606 mmHg
Explanation:
Step 1: Data given
Percentage N2 = 22.8 %
The total pressure = 785.0 mmHg
Step 2: Calculate partial pressures
Partial pressure = percentage * total pressure
Partial pressure N2 = 0.228 * 785.0 mmHg
Partial pressure N2 = 179 mmHg
Step 3: Calculate partial pressure O2
Partial pressure O2 = 785.0 mmHg - 179.0 mmHg
Partial pressure O2 = 606 mmHg
OR (1 - 0.228) * 785.0 = 606 mmHg
The partial pressure of oyxgen O2 is 606 mmHg