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
Darya [45]
3 years ago
15

ASAP PLEASE

Chemistry
1 answer:
dimaraw [331]3 years ago
6 0
The mass of Hydrogen is 2 g/mol
The mass of Helium is 4 g/mol
You might be interested in
Which statement describes the effect of sorting and recombining genes in sexual reproduction?
Setler79 [48]
The fourth option I think
7 0
3 years ago
Which of the following best describes a mole as used in chemistry?
bazaltina [42]

Answer: a very large number of objects

Explanation: Mole is the amount of objects and it has the usually Avogadro number of atoms, molecules, ions, etc in chemistry

8 0
3 years ago
Why is copper a pure substance? a. because it is an element b. because it is a compund c. because it is a homogenous mixture
Step2247 [10]

Answer:

a. because it is an element

Explanation:

its pure because it only has one type of atom, making it an element

6 0
2 years ago
a cube of iron (cp = 0.450 j/g•°c) with a mass of 55.8 g is heated from 25.0°c to 49.0°c. how much heat is required for this pro
krek1111 [17]
Q = ?

Cp = 0.450 j/g°C

Δt =  49.0ºC - 25ºC => 24ºC

m = 55.8 g

Q = m x Cp x Δt

Q = 55.8 x 0.450 x 24

Q = 602.64 J

hope this helps! 
7 0
3 years ago
Read 2 more answers
What are the chemical formulas for..
andrezito [222]
S4O5
S3O
SeF6
N4S5
CCl9

All numbers should be subscripts
6 0
3 years ago
Other questions:
  • Which acid has the greatest acid dissociation constant?
    7·2 answers
  • Explain why a balloon filled with O2 at room temperature collapses when cooled in liquid nitrogen where as balloon filled with H
    12·1 answer
  • The results of Rutherford’s gold foil experiment disproved the model of the atom that his mentor and colleague had proposed. How
    7·1 answer
  • What phase of matter has particles that are held together but can flow past each other and takes the shape of a container, filli
    15·2 answers
  • a sample of the hydrate of sodium carbonate has a mass of 8.85 g. it loses 1.28 g when heated. find the molar ratio of this comp
    11·1 answer
  • The molar mass of vitamin A (C20H30O).
    11·1 answer
  • For the following amino acids, draw a triangle around the amine group, draw a square around the carboxyl and circle the side gro
    11·1 answer
  • Acidic solutions contain high concerntrations of
    7·1 answer
  • What can an increase in energy do to a solid?
    6·1 answer
  • A gas that occupies 50.0 liters has its volume increased to 68 liters when the pressure was changed to 3.0 ATM. What was the ori
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!