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Chemistry 102 Q&A Archive of February 11, 2023

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February 11 of 2023

What must be the molar mass of a gas that requires 64 s to effuse under identical conditions
A 6.40-g sample of Fe3O4 reacts with O2 to produce Fe2O3: 4Fe3O4(s) + O2(g) -> 6Fe2O3(s) Determine the number of g of Fe2O3 produced, assuming that O2 is in excess. Enter your answer in the provided box. g Fe2O3
how many moles are there in 20g of CaCO3 (CaCO3=100)
Nuclei of 21286Rn decay by a-cmission to 208 sPo with a mean life of 23.9 min. The 208H4 Po nuclei in turn decay, also by α-emission, to the stable isotope 204 Pb with a mean life of 2.9 years. If initially the source is pure 212Rn, how long will it take for the rate of α-emission in the final…
Instead of using specific heat, what other formula can you use to calculate the heat of reaction? Explain in what condition that formula can be applied.
Explain the trend in time taken for cross marked disappear with concentration of thiosulfate.
Please explain the setup of d. How do we find the equilibrium partial pressure?
A 2.46 M solution of citric acid (H3C6H5O7) in water has a density of 1.10 g/mL. Determine the mass percent, molality, and normality of the citric acid. (Citric acid has three acidic protons.) What is the mass of water in one liter of solution? There are 473 g H3C6H5O7 in 1 L (1.10×103 g)…
C. Determining the Density of an Unknown Solid 1. The mass of unknown solid calculated in section \( \mathrm{A}: \quad 17.2660 \) 3. Graduated cylinder reading -initial: \( \frac{56 \mathrm{~mL}}{4.5 \mathrm{~mL}} \frac{1.2 \mathrm{~mL}}{2.6 \mathrm{ml}} \) 5. Density of unknown: 6. Average…
The four lines emitted in the visible region for H correspond to electron transitions from the n=3, 4, 5, and 6 levels to the n=2 level. Which set of transitions would be detected in the UV region? a. from the n= 3, 4, 5, and 6 levels to the n=3 level b. from the n=3, 4, 5, and 6 levels to…
The four lines emitted in the visible region for H correspond to electron transitions from the n=3, 4, 5, and 6 levels to the n=2 level. Which set of transitions would be detected in the UV region? a. from the n= 3, 4, 5, and 6 levels to the n=3 level b. from the n=3, 4, 5, and 6 levels to…
What must be the molar mass of a gas that requires 64 s to effuse under identical conditions
A 6.40-g sample of Fe3O4 reacts with O2 to produce Fe2O3: 4Fe3O4(s) + O2(g) -> 6Fe2O3(s) Determine the number of g of Fe2O3 produced, assuming that O2 is in excess. Enter your answer in the provided box. g Fe2O3
how many moles are there in 20g of CaCO3 (CaCO3=100)
Nuclei of 21286Rn decay by a-cmission to 208 sPo with a mean life of 23.9 min. The 208H4 Po nuclei in turn decay, also by α-emission, to the stable isotope 204 Pb with a mean life of 2.9 years. If initially the source is pure 212Rn, how long will it take for the rate of α-emission in the final…
Instead of using specific heat, what other formula can you use to calculate the heat of reaction? Explain in what condition that formula can be applied.
Explain the trend in time taken for cross marked disappear with concentration of thiosulfate.
Please explain the setup of d. How do we find the equilibrium partial pressure?
A 2.46 M solution of citric acid (H3C6H5O7) in water has a density of 1.10 g/mL. Determine the mass percent, molality, and normality of the citric acid. (Citric acid has three acidic protons.) What is the mass of water in one liter of solution? There are 473 g H3C6H5O7 in 1 L (1.10×103 g)…
The four lines emitted in the visible region for H correspond to electron transitions from the n=3, 4, 5, and 6 levels to the n=2 level. Which set of transitions would be detected in the UV region? a. from the n= 3, 4, 5, and 6 levels to the n=3 level b. from the n=3, 4, 5, and 6 levels to…
The four lines emitted in the visible region for H correspond to electron transitions from the n=3, 4, 5, and 6 levels to the n=2 level. Which set of transitions would be detected in the UV region? a. from the n= 3, 4, 5, and 6 levels to the n=3 level b. from the n=3, 4, 5, and 6 levels to…