Explain how many moles of h atoms

Assignment Help Chemistry
Reference no: EM13669940

The density of sodium borohydride is 1.492g*cm3. If 3.93 g of sodium borohydride contains 2.50*10^23 H atoms, Explain how many moles of H atoms are present in 28.0 cm3 of sodium borohydride?

Reference no: EM13669940

Questions Cloud

Explain the energy necessary to excite an electron : On or after the Bohr model of the hydrogen atom we can conclude that the energy necessary to excite an electron from n = 2 to n = 3 is the energy to excite an electron from n = 3 to n = 4.
Find the potential energy of the block at the top of incline : Starting from the top and at rest a block slides down an inclined plane and has a velocity of 1.45 m/s at the bottom. Find the potential energy of the block at the top of the incline
Compute the standard heat of formation of acetaldehyde : Compute the standard heat of formation of acetaldehyde CH3CHO (g) given the following information
Determine the speed of the block : A 4.1 kilogram block is dropped onto a spring of spring constant 2014 N/m from a height of 1500 centimeter. Determine the speed of the block when the compression of the spring is 10 cm
Explain how many moles of h atoms : The density of sodium borohydride is 1.492g*cm3. If 3.93 g of sodium borohydride contains 2.50*10^23 H atoms, Explain how many moles of H atoms are present in 28.0 cm3 of sodium borohydride
Find the ratio of the car apparent weight to its true weight : A roller coaster car crosses the top of a circular loop-the-loop at twice the critical speed. Find the ratio of the car apparent weight to its true weight
Explain what was the percentage yield : The nitrogen gas above was collected over water, the volume of 'wet' nitrogen produced at 23C and 99.5kPa was 14.81mL. Explain what was the percentage yield. The vapor pressure of water at 23C is 2.81kPa
Find the object position for which resulting image upright : A concave mirror has a radius of curvature of 5.5 centimeter. Find the object position for which the resulting image is upright and five times the size of the object
Compute the mean potential energy as well as mean kinetic : Compute the mean potential energy as well as the mean kinetic energy of an electron in the ground state of a hydrogenic atom.

Reviews

Write a Review

Chemistry Questions & Answers

  Compute difference in pressure between ch4 and an ideal gas

Compute the difference in pressure between CH4 and an ideal gas if 14.0 moles of gas are in a 6.00 litres tank at the temperature of 21.1 degree celsius . The van der Waals constants for CH4 are a =2.300 L^2 x atm/mol ^2 and b=0.0430 L/mol.

  Define how many grams of dry nh4cl need to be added

How many grams of dry NH4Cl need to be added to 2.30 L of a 0.100 M solution of ammonia,NH3, to prepare a buffer solution that has a pH of 9.00

  State a complete ionic equation for the reaction that occurs

Write the complete ionic equation for the reaction that occurs when a few drops of HCl are added to the buffer.

  Evaluate the mass of potassium in the mixture

A 29.7 g mixture of the compounds magnesium oxide and potassium chloride is 57.7 % by mass magnesium oxide. The compound potassium chloride is 47.6 % by mass chlorine. Calculate the mass (g) of potassium in the mixture.

  Helium gas at 25 oc filled a balloon to a volume of 225 l

helium gas at 25 oc filled a balloon to a volume of 2.25 l. what would the volume of this balloon be when cooled at

  Explain the molal freezing point depression of water

if 11.3g of Ca(NO3)2 dissolves in 115.0g of water, the freezing point is depressed by -3.34C. from this data, what is the molal freezing point depression of water

  Define what mass of ni metal can be produced by electrolysis

What mass of Ni metal can be produced by electrolysis from a solution of Ni2+ (aq) at a current of 15.0 amps for 1.00 hour

  How much heat will be released when 644 grams of sulfer

how much heat will be released when 6.44 grams of sulfer reacts with excess oxygen according to the following equation?

  Explain bonding using valence bond theory

Consider the bonding in the following using valence bond theory. For which would dissH be the smallest

  Explain the conversion of cyclopropane and an anesthetic

The conversion of cyclopropane, an anesthetic, to propylene has a rate constant k - 1.3x10?6 s?1 at 400°C and k = 1.1x10?5 s?1 at 430°C. a) What is the activation energy in kJ mol?1

  Define the rate constant for the reaction at 25.0 degrees c

In a study of alcohol dehydrogenase on alcohol at25.0 degrees Celcius, the concentration of ethanol in a first order reaction decreases from 15.0mmol/L to 5-0mmol/L in 2.5*10^4s. What is the rate constant for the reaction at 25.0 degrees C

  Explain the movable plunger on a syringe

Because of the movable plunger on a syringe, the gas inside the syringe can be held at a constant pressure of 1.00 atm while allowing the volume of the gas to increase or decrease.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd