1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
olga2289 [7]
3 years ago
6

How many molecules of hypothetical substance b are produced when 29.9g of hypothetical substance a reacts? the molar mass of sub

stance a is 15.7 g/mol?
Chemistry
1 answer:
Andrej [43]3 years ago
5 0
<span>1.15x10^24 molecules of hypothetical substance b Making the assumption that each molecule in hypothetical substance a reacts to produce a single molecule of hypothetical substance b, then the number of molecules of substance b will be the number of moles of substance a multiplied by avogadro's number. So Moles hypothetical substance a = 29.9 g / 15.7 g/mol = 1.904458599 moles This means that we should also have 1.904458599 moles of hypothetical substance b. And to get the number of atoms, multiply by 6.0221409x10^23, so: 1.904458599 * 6.0221409x10^23 = 1.146892x10^24 molecules. Rounding to 3 significant figures gives 1.15x10^24</span>
You might be interested in
Answer the question below based on the periodic table entry for bromine.
Shalnov [3]
<span>The number of neutrons bromine will have are equal to
= protons + neutrons
so,
80-35=45</span>
4 0
3 years ago
Read 2 more answers
Why do two oxygen atoms form a double covalent bond?
elena-s [515]

A lone oxygen atom has 6 electrons in its outer shell which is not very stable, whereas as full octet (8 outer shell electrons) is stable. In order to achieve this two oxygen atoms will share 4 electrons, each contributing 2 electrons. Since these electrons exist within the orbitals of both atoms, to oxygen atoms essentially achieve a full octet.

5 0
3 years ago
HCI + NaOH --&gt; NaCl + H 20
Vikki [24]

Answer:

option D is correct

Explanation:

no of moles in 3 grams of HCL=3/36=0.08

if 1 mole of HCL require 1 mole of NaOH then 0.08 moles required 0.08 moles of NaOH

mass of 0.08 moles of NaOH=moles*molar mass=0.08*40=3.2 grams

so 3 grams are required in the reaction

6 0
2 years ago
You have a radioactive isotope with a mass of 400 grams. The sample has a half life of 5 days. How much is left after 25 days ha
Alexeev081 [22]

Answer:

Amount left after 25 days = 12.5 g

Explanation:

Given data:

Mass of sample = 400 g

Half life of sample = 5 days

Mass left after 25 days = ?

Solution:

First of all we will calculate the number of half lives passes in given time period.

Number of half lives = Time elapsed / Half life

Number of half lives = 25 days/ 5 days

Number of half lives = 5

At time zero = 400 g

At 1st half life = 400 g/2 = 200 g

At 2nd half life = 200 g/2 = 100 g

At 3rd half life = 100 g/2 = 50 g

At 4th half life = 50 g/2 = 25 g

At 5th half life = 25 g/2 = 12.5 g

4 0
2 years ago
when positively charged particles were radiated onto a gold atom, most of the particles went straight past. what is most likely
S_A_V [24]
Did you ever find out the answer I'm in dier need

7 0
2 years ago
Other questions:
  • Plz help me and I promise I will make you he brainiest
    8·1 answer
  • Energy in an ecosystem flow from consumers to producers.True of False
    12·2 answers
  • Write equations for the reaction of 1 mol of Barium Hydroxide with 2 Moles of hydrochloric acid
    15·1 answer
  • Butane (c4 h10(g), hf = –125.6 kj/mol) reacts with oxygen to produce carbon dioxide (co2 , hf = –393.5 kj/mol ) and water (h2 o,
    14·2 answers
  • Peptides can be separated using an ion-exchange column based on their isoelectric (pl) values. At which pH values would two diff
    6·1 answer
  • Both HNO3(aq) and CH3COOH(aq) can be classified as *
    8·2 answers
  • The equilibrium constant for the chemical equation is Kp = 5.23 at 191 °C. Calculate the value of the Kc for the reaction at 191
    6·1 answer
  • 1 You place a 28.95-g piece of gold in a 10-ml graduated cylinder. The level of the water rises 1.50 mL. What is the density of
    14·1 answer
  • How many moles are in 182 grams of BC13?
    10·1 answer
  • Vanillin the flavoring agent in vanilla has a mass percent composition of 63.15 per h ,31.55per o. determine the empirical formu
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!