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
vodomira [7]
3 years ago
14

A radioactive isotope has a half-life of 3.0 hours. If a scientist has 30 grams of the isotope, how much is left after 15 hours?

Chemistry
1 answer:
dmitriy555 [2]3 years ago
7 0

Answer:

0.9375

Explanation:

3.0x30x15 = 17 496 000 kg sx^{2}

subtract or divde

then you take the 9 and 375 add 0.9000 and combine them and there you go.

                                                          +\frac{0.9000}{375} =0.9375

You might be interested in
6. Cuando se oxidan en el aire 12,120 g de vapor de Zinc se obtienen 15,084 g del óxido. ¿Cuál es la fórmula empírica del óxido?
Eddi Din [679]

Answer:

 12120 g  +    O2        =    15084 g

m Zn = 12.120 Kg

m óxido = 15.084 Kg

1. calcular la masa de cinc en gramos

g = 12,120 Kg x 1000 = 12120 g de cinc

g = 15.084 Kg x 100 = 15084 g de oxígeno

2.  calcular gramos de Oxigeno

g O = 15084 g - 12120 g = 2964 g O2

3. calcular % de Zn y O

%m/m ( m soluto / m solc.) x 100

%m/m (Zn) =  ( 1210 g / 15084 g ) x 100

% m/m (Zn) = 80.35 % = 80.35 g

%m/m (O) =  ( 2964 g / 15084 g ) x 100

% m/m (Zn) = 19.65 %  = 19.65 g

4. Calcular moles de cada elemento

Zn: 80.35 g / 65.38 g/mol = 1.228 mol

O: 19.65 g / 16 g/mol = 1.228 mol

5. dividir entre el menor de los elementos

Zn: 1.228 mol / 1.228 mol = 1

O: 1.228 mol / 1.228 mol = 1

6. Fórmula empírica: ZnO

3 0
3 years ago
Which laws can be combined to form the ideal gas law?
slava [35]

Option 3- Avogadro's, Charles's and Boyle's


6 0
3 years ago
(02.02 LC) The two main types of weathering are Select one:
Firlakuza [10]

Answer:

d

Explanation:

4 0
3 years ago
What factors does the climate include?
rosijanka [135]

Answer:

A. amount of precipitation, average temperature

Explanation:

Precipitation and average temperature are factors that climate includes. These factors are determined by other factors such as location of an area(like how far a place is from large bodies of water like the sea), ocean currents, lattitude (distance from the equator), winds (prevailing winds) , topography (such as mountains) and the like.

7 0
4 years ago
The specific heat of gold is 0.031 calories/gram°C. If 10.0 grams of gold were heated and the temperature of the sample
IgorLugansk [536]

Answer:

6.2 calories

Explanation:

Data Given:

change in temperature = 20 °C

specific heat of gold = 0.031 calories/gram °C

mass of gold = 10.0 grams

Amount of Heat = ?

Solution:

Formula used

             Q = Cs.m.ΔT

Where:

Q = amount of heat

Cs = specific heat of gold = 0.031 calories/gram °C

m = mass

ΔT = Change in temperature

Put values in above equation

                Q = 0.031 calories/gram °C x 10.0 g x 20 °C

                Q = 6.2 calories

So option A is correct = 6.2 calories

6 0
4 years ago
Other questions:
  • Why was Niels Bohr’s atomic model superior to all the earlier models?
    9·2 answers
  • What is the hydroxide ion concentration in a solution of NH3 with a pOH of 4.65?
    12·2 answers
  • Which term refers to the movement of materials through a cell membrane when the cell’s energy is required?                      
    15·1 answer
  • Extracted from olives, canola, and corn are plant lipids and are liquid at room temperature.
    15·1 answer
  • When iron metal reacts with sulfuric acid, it produces iron (III) sulfate and hydrogen gas. Balance the equation: Fe + H2SO4 → F
    11·1 answer
  • What is the speed of an electromagnetic wave with a frequency of 1.33x10^17Hz and a wavelength of 2.25nm?
    12·2 answers
  • How many Cl atoms are in Zn(ClO3)2?<br> O A. 2<br> O B. 1<br> O c. 3<br> O D. 6
    10·1 answer
  • Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Ca^2 , Al^3 ,I
    9·1 answer
  • HELP!!!!!! PLEASE!!!
    12·1 answer
  • A sample of 4.0 L of nitrogen, at 1.2 atmospheres, is transferred to a 12 L container.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!