General Chemistry Answers

how use Bohr's equation to calculate. how much energy in joule is needed to promote an electron from H-atom n=1 to the n=4 level?

How many C₆H₁₂O₆ molecules are contained in a 100g sample of C₆H₁₂O₆

If a bottle of concentrated hydrochloric acid contains a density of 36% by weight and a specific weight of 1.18, what is its standard of acid?

Garlic is very common in our kitchen and taste when we eat food. It makes the food delicious and give an aroma that excite you to eat. Allicin is the compound responsible for its smell. The molecular formula of a allicin is C₆ H₁₀ OS₂

a. What is the molar mass of allicin?

b. How many moles of allicin are present in 8.00 mg of this substance?

c. How many molecules of allicin are in 4.00 mg of this substance

d. How many S atoms are present in 2.00 mg of allicin?

Calculate the number of formula units of Li2CO3 present in a 0.500g sample of lithium carbonate. Li=7, C=12, O=16

What volume of a 0.300 M solution of aluminum fluoride would be required to obtain 14.0 g of aluminum fluoride

The allowed concentration level of vinyl chloride, CHCL in a chemical plant is

Calculate the mass, in grams, of iron(II) sulfate that must be added to a 500-mL volumetric flask in order to prepare 500 mL of a 0.196 M aqueous solution of the salt.

A solid sample known to consist of approximately equal amounts of two or more of the following soluble salts. AgNO, ZnCL K.CO, MgSO, Ba(C2H302)2NH4NO3 A sample of the solid, sufficient to give least 0.04 mol of any single salt, was added to 100 mL of water, yielding a white precipitate and a clear solution. The precipitate was collected and rinsed with water. When a portion of the precipitate was placed in dilute HNO,, it completely dissolved. leaving a colorless solution. A second portion of the precipitate was placed in dilute HCI, yielding a precipitate and a clear solution. Finally, the filtrate from the original precipitate was treated with excess NH₁, yielding a white precipitate. Indicate which of the soluble salts must be present in the sample, which must be absent and those for which there is insufficient information to make this determination

A 38.63-mg sample of potassium ozonide, KO,, was heated to 70 °C for 1 h, undergoing a weight loss of 7.10 mg. Write a balanced chemical reaction describing this decomposition A 29.6-mg sample of impure KO, experiences a 4.86-mg weight loss when treated under similar condition. What is the w/w KO, in the sample?