Answer:
118 elements
Explanation:
Of these 118 elements, 94 occur naturally on Earth.
Answer:
(B) 0.038 M
Explanation:
Kc = [H2][I2]/[HI]^2
Let the equilibrium concentration of H2 be y M
From the equation of reaction, mole ratio of H2 to I2 formed is 1:1, therefore equilibrium concentration of I2 is also y M
Also, from the equation of reaction, mole ratio of HI consumed to H2 formed is 2:1, therefore equilibrium concentration of HI is (1 - 2y) M
1.6×10^-3 = y×y/(1 - 2y)^2
y^2/1-4y+4y^2 = 0.0016
y^2 = 0.0016(1-4y+4y^2)
y^2 = 0.0016 - 0.0064y + 0.0064y^2
y^2-0.0064y^2+0.0064y-0.0016 = 0
0.9936y^2 + 0.0064y - 0.0016 = 0
The value of y must be positive and is obtained by using the quadratic formula
y = [-0.0064 + sqrt(0.0064^2 - 4×0.9936×-0.0016)] ÷ 2(0.9936) = 0.0736 ÷ 1.9872 = 0.038 M
<span>The law of conservation of mass applies to all chemical reaction, so this means that there was equal mass before and after the reaction. However, if the mass has decreased, then it means there has been a loss of substance. The most common cause of this is the liberation of gases from a chemical reaction mixture, the mass of which is not measured by the scale.</span>
Continental air mass, vast body of air that forms over the interior of a continent, excluding mountainous areas. See air mass.
Answer:
The final temperature of the mixture is closest to 30ºC
Explanation:
<u>Step 1:</u> Data given
Volume of sample 1 = 30 mL ≈ 30 grams
Temperature of sample 1 = 10 °C
Volume of sample 2 = 50 mL ≈ 50 grams
Temperature of sample 2 = 50 °C
Step 2: Calculate the final temperature
T(final) = (30 g * 10 °C + 50 g * 50 °C) / (50 g + 30 g)
T(final) = (300 + 2500)/80
T(final) = 35 °C
The final temperature of the mixture is closest to30ºC
