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,...
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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 (...
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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...
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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

#### A piston containing 0.120moles CH4, has a volume of 2.12L. If methane is added until the volume is increased to 3.12liters with no change in pressure or temperature, how many grams are in the piston?

i really need to know HOW to do this. i am having the hardest time.

#### 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

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

#### 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...
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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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