A compound has a molar mass of 100 g/mol and the percent composition (by mass) of 65.45% C, 5.45% H, and 29.09% O. Determine the empirical formula and the molecular formula.

Assuming that you work in a confectionery industry which include gum, sugars, and chocolates which are polysaccharides, describe a hypothetical method of developing a confectionery that will have a jelly-like consistency inner layer enclosed in a brittle outer layer. (Clue: You may prepare each layer and alter their properties separately prior to mixing. Provide biochemical explanation.)

For the reaction; write the conventional equation, ionic equation, and net ionic equation, when solid copper (II) hydroxide is "dissolved" by hydrochloric acid.

1. Write the isotope needed, by identifying A, Z, and X, to balance the following nuclear fission reaction: 23592U+10n→14054Xe+AZX+4 10

How many grams of water at 25°C must be added to a Dewar flask (isolated system) containing 20 g of ice at -5°C to satisfy the conditions in (a) through (d)? Compute the entropy change in each case.

Predict the sign of ΔS in each case before doing the calculation.

a) The final temperature is -2°C; all the water freezes.

b) The final temperature is 0°C; half the water freezes

c) The final temperature is 0°C; half the ice melts

d) The final temperature is 10°C; all the ice melts

Describe the pathway your body uses to produce energy during a period of starvation?

A 21.8 g sample of ethanol (C₂H₅OH, 46.07 g/mol) is burned in a bomb calorimeter, according to the following reaction equation. If the temperature of the rises from 13.0 °C to 79.3 °C, what is the heat capacity of the calorimeter?

C₂H₅OH(l) + 3 O₂(g) →2 CO₂(g) + 3 H₂O(g)    ΔH°_rxn = –1235 kJ

1. Complete both questions: a. Prove that HSO₄^-  can act as an amphoteric substance. b. Explain why CH₄ cannot act as an amphoteric substance.

2. Try this question again. Be sure to use claim-evidence-reasoning when you format your answer and be sure to show your work for any calculations performed to develop your evidence. Which is more dangerous if you spill it on your hand a 0.025 M HBr solution (Ka = 1.3 x 10⁶ ) or 0.75 M HClO₂ solution (Ka = 1.2 x 10^-2 )?

3.  For each pair below indicate which is stronger and support your answer with an explanation. a. Which is a stronger acid, H₂S or PH₃? b. Which is a stronger base CO₃^-2  or C₂H₅O^-  ?

4. Calculate the equilibrium concentration of NO in the reversible reaction below using the initial concentrations given for each reactant and product. The equilibrium constant for the reaction is Kp = 20. 2 NO (g) ⇌ N2 (g) + O2 (g) Initial concentrations: [N2] = 0.5 atm, [O2] 0.5 atm, [NO] = 0.75 atm

Use the Ksp value in the table to calculate the molar solubility of AgBr, Fe(OH)2, and PbBr2 in pure water

The pKapKa of hypochlorous acid is 7.530. A 60.0 mL solution of 0.130 M sodium hypochlorite (NaOCl) is titrated with 0.335 M HClHCl.

Calculate the pH of the solution after the addition of 7.85 mL of 0.335 M HClHCl.

pH= ???

Calculate the pH of the solution after the addition of 24.6 mL of 0.335 M HClHCl.

pH= ???

Calculate the pH of the solution at the equivalence point with 0.335 M HCl.

pH= ???

If a balloon has a volume of 1.900 L at a pressure of 1.947 atmospheres, what will be the volume of the balloon if the pressure is increased to 4.624 atmospheres?

Give your answer to four significant figures.

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Question

Buffy carries out a neutralization reaction in her styrofoam cup calorimeter, with a heat capacity of 41 J/C. She mixes 25.0mL of 3.0M acid solution and 25.0mL of 3.0M base solution at 22.3 degree C. The temperature rose to 36.5 C. D=1.03 g/ml and Heat Capacity= 4.05 J/g*C

-Calculate heat energy absorbed by solution (qsolution)

-Calculate heat energy absorbed by the calorimeter (qcalorimeter)

-Calculate q reaction

-calculate number of moles of acid reacting

-calculate delta H neut. of the reaction in joules/mole

Combustion analysis of a 0.2608 g sample of a compound containing carbon, oxygen, and hydrogen only produced 0.5501 g of carbon dioxide, and 0.2703 g of water.

Determine the empirical formula of this compound. If the molar mass for this compound is 104.1 g/mole, find the molecular formula. Write a complete balanced equation for the combustion reaction of this compound.

What kind of shift occurs when you add KNO3 to the equilibirum reaction: Fe3+ + SCN- <=> FeSCN2

i know the reaction turns into an orange color