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03/21/20

chem homework please help

The combustion of octane, C 8 H 18 , proceeds according to the reaction shown. 2 C 8 H 18 ( l ) + 25 O 2 ( g ) ⟶ 16 CO 2 ( g ) + 18 H 2 O ( l ) If 4.90 × 10 2 mol of octane combusts,... more

03/21/20

chem homework please help!

Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl ( aq ) , as described by the chemical equation MnO 2 ( s ) + 4 HCl ( aq ) ⟶ MnCl 2 (... more

03/20/20

Dimensional analysis format

When 1.1 g of black copper (II) oxide Is mixed with an of hydrochloric acid the solution turns clear green, indicating the formation of copper (II) chloride. How many grams of copper (II) chloride... more

03/20/20

Dimensional analysis format

How many grams of copper (II) hydroxide can be prepared from 2.7 g of copper (II) nitrate reacting with sodium hydroxide

03/20/20

How many atoms of helium are in 53.1L of He at STP?

in scientific notation and in standard notation if you please so i can learn the differences.

03/20/20

the width of a rectangle is the length minus 7 units. The area of rectangle is 8 units. What is the length, in units, of the rectangle?

the width of a rectangle is the length minus 7 units. The area of rectangle is 8 units. What is the length, in units, of the rectangle?

03/19/20

Calculate the ∆H for the following reaction: NO + O 🡪 NO2

You are given these three equations: O2 🡪 2O   ∆H = +495 kJ 2O3 🡪 3O2  ∆H = -427 kJNO + O3 🡪 NO2 + O2   ∆H = -199 kJ 

i dont get how to solve this question.

what is the answer to 6 > y + 3 ?

03/19/20

Calculate the ∆H for the following reaction: 4Al + 3MnO2🡪 2Al2O3 + 3Mn

You are given these two equations: 4Al  + 3O2 🡪 2Al2O3  ∆H = -3352 kJ Mn  + O2 🡪  MnO2  ∆H = -521 kJ

03/19/20

Calculate the ∆H for the following reaction: CS2 + 2H2O 🡪 CO2 + 2H2S

You are given these two equations: H2S + 1.5O2 🡪  H2O + SO2  ∆H = -563 kJ CS2  + 3O2 🡪 CO2  + 2SO2  ∆H = -1075 kJ 

03/19/20

Chemistry energy math

Determine the amount of energy (heat) in joules required to raise the temperature of 5 kg of iron from 50 c to 37 c

03/19/20

Algebra / Investments

Sam invested $2050, part of it at 6% and the rest at 8% yearly interest. The yearly income on the 8% investment was $34 more than twice the income from the 6% investment. How much did he invest at... more

03/19/20

algebra question

A mass of 25 g stretches a spring 10 cm. If the distance a spring is stretched is directly proportional to the mass, what mass will stretch the spring 16 cm?

03/19/20

How many grams of CaCl2 should be dissolved in 449.3 mL of water to make a 0.11 M solution of CaCl2?

How many grams of CaCl2 should be dissolved in 449.3 mL of water to make a 0.11 M solution of CaCl2?

03/18/20

What is the molarity of a bleach solution containing 5.8 g of NaOCl per liter of bleach?

What is the molarity of a bleach solution containing 5.8 g of NaOCl per liter of bleach?

03/18/20

You have 1881.4 g of a bleach solution. The percent by mass of the solute sodium hypochlorite, NaOCl, is 3.62%. How many grams of solvent are in the solution?

You have 1881.4 g of a bleach solution. The percent by mass of the solute sodium hypochlorite, NaOCl, is 3.62%. How many grams of solvent are in the solution?

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