Chemistry Answers

Calculate the percentage of Oxygen in Vitamin C

how much heat energy is used to vaporize 3.5 mol of chloroethane at its normal boiling point 12.3°c given Hvap= 24.7k/mol

1. Answer the problem using the step by step process.

2. Write the 3 digits after the decimal point. ( NO ROUND OFF )

3. Box your answer.

Given:

1 = 2.5 ohms

2 = 3 ohms

3 = 1.7 ohms

4 = 3.7 ohms

5 = 9 ohms

6 = 4.5 ohms

7 = 5 ohms

8 = 7.8 ohms

9 = 13 ohms

Voltage total = 100 volts

Solve for:

Resistance total

Current total

Voltage from 1 to 9

Current from 1 to 9

PLEASEEEEE ANSWER ASAP!

Consider the reaction: 2C₂H₂(g) + 3O₂(g) → 4CO₂(g) + 2H₂O(l);

ΔH_fº C₂H₂(g) = 54.20 kJ/mol

ΔH_fº H₂O(l) = –68.30 kJ/mol

ΔH_fº CO₂(g) = –94.10 kJ/mol

(i) What is the standard enthalpy of formation of O₂? Answer

 kJ/mol

(ii) What is the standard enthalpy change for this reaction? Answer

 kJ

Show the solution in calculating the pH for the following data:

• Vol NaOH = 0.00, pH = 3.30
• Vol NaOH = 24.90, pH = 5.87
• Vol NaOH = 26.00, pH = 9.12

how many grams of water can be heated from 20.0 c to 50.0 c using 12500.0 joules

Given the following, find the number of moles:14.2g of Co2

A. 0.32

B. 0.32 mol CO2

C. 0.4 mol CO2

D. 1.00 mol CO2

How much heat is absorbed by 20 g granite boulder as energy from the sun causes its temperature to change from 10°C to 29°C? (Specific heat capacity of granite is 0.1cal/goC) 38 cal

The reaction between solid white phosphorus and oxygen produces solid

tetraphosphorusdecoxide (P4010).

a. Write the balanced chemical equation of the reaction

b. Determine the mass of tetraphosphorusdecoxide (P4010) formed if 26.0 g of

phosphorus (Pd) and 49.5 g of oxygen (O2) are combined.

c. How much of the excess reactant remains after the reaction stops?

beryllium (Z=4) and its cation formed when losing two

electrons.