Answer is: <span>the empirical formula of enargite is Cu</span>₃AsS₄.<span>
If we use 100 grams of enargite:
n(Cu) = 48,41 g </span>÷ 63.55 g/mol.
n(Cu) = 0.761 mol.
n(As) = 19.02 g ÷ 74.92 g/mol.
n(As) = 0.254 mol.
n(S) = 32.57 g ÷ 32.065 g/mol.
n(S) = 1.016 mol.
n(Cu) : n(As) : n(S) = 0.761 mol : 0.254 mol : 1.016 mol / 0.254.
n(Cu) : n(As) : n(S) = 3 mol : 1 mol : 4 mol.
Answer:
The correct answer will be
Test variable or dependent variable- The time required to melt the ice cube
Explanation:
In a scientific experiment, three types of variables are kept and studied which includes: The independent variable, dependent variable and the constant variable.
Among these three, the variable to be tested is known as the dependent variable which is influenced by the independent variable which changes.
In the given question, since the experiment was performed to test the rate of the release of heat by a different substance which could be tested by measuring the rate or time required to melt the ice cube which depends on the type of casserole.
Thus, the time required to melt the ice cube is the correct answer.
Natural gas (47%)
Renewables - Solar (14%)
Oxidation is the loss of electrons. Reduction is the gain of electrons. The oxidizing agent is reduced. The reducing agent is oxidized. Cu goes from 0 to +2, it lost electrons S went from +6 to +4, it gained electrons I went from 0 to +5, it lost electrons N went from +5 to +4, it gained electrons.