Answer:
23 kPA
Explanation:
95kPa = 24kPA (CO2) + 48 kPa (N) + x kPa (O)
24kPA(CO2)+ 48kPA (N) = 72 kPA
95kPA - 72kPA= 23kPA (O)
Answer:
0.0225 M
Explanation:
In<em><u> one liter</u></em> of this solution, there are 45 mEq of Ca⁺².
1 mEq of Ca⁺² is equal to 20 mg of Ca⁺. We know this by dividing its molar mass (40) by the charge of the ion (2).
Meaning that <em>45 mEq of Ca⁺² is equal to (45 * 20) 900 mg of Ca⁺²</em>.
Now we <u>convert 900 mg of Ca⁺² into moles</u>, using its<em> molar mass</em>:
- 0.9 g Ca⁺² ÷ 40 g/mol = 0.0225 mol Ca⁺²
Finally we calculate the molarity of the solution:
- Molarity = moles / liters
- 0.0225 mol / 1 L = 0.0225 M
Answer:
D
Explanation:
Measurements that are close to a standard measured value is accurate. But when measured values are close to each other they are precise. For example, if one measures the weight of 1 kg of rice as 945 g and another person measure it as 955 g, then the second person’s ,measurement is more accurate. Now if the first person measured the same bag of rice thrice and got values 945 g, 946 g and 947g whereas the second person got values 955g, 950 g and 940 g, in such a case the first person’s measured value is more precise.
Answer:
C.) That all matter was composed of earth, fire, water and air
Explanation:
Just took the test
