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Evgesh-ka [11]
3 years ago
13

what is the molarity of a solution prepared by dissolving 15.0g of sodium hydroxide in enough water to make a total of 225 ml of

solution​
Computers and Technology
1 answer:
Reptile [31]3 years ago
5 0

Answer:

1.6666 g/mol = 1 \frac{2}{3} g/mol

Explanation:

Molar mass of NaOH= 23+16+1 =40g/mol

Mols in 15g = 15/40 mol

If this was dissolved in 225ml of water molarity of the solution is

\frac{15}{40} ÷ 225 x 1000 = 1.6666 g/mol = 1 \frac{2}{3} g/mol

You might be interested in
Write a static boolean method named beginsWithZ. It should accept a String object as a parameter. It should return true if the f
almond37 [142]

Answer:

public static boolean beginsWithZ(String word){

if(string == null || string.length() == 0)

return 0;

if(word.charAt(0) == 'Z' || word.charAt(0) == 'z')

return 1;

else

return 0;

}

Explanation:

This method is a boolean method, meaning it returns true if the string begins with Z or z and false otherwise. So:

The Java command charAt() let's you find the character at each position of the string, so i use it.

public static boolean beginsWithZ(String word){

if(string == null || string.length() == 0)

return 0;

if(word.charAt(0) == 'Z' || word.charAt(0) == 'z')

return 1;

else

return 0;

}

6 0
3 years ago
This program will store roster and rating information for a soccer team. Coaches rate players during tryouts to ensure a balance
aksik [14]

Answer:

import java.util.Scanner;

public class TeamRoster {

  public static void main(String[] args) {

     Scanner scan = new Scanner(System.in);

     int[][] players = new int[5][2];

     boolean keepAlive = true;

     char input;

     

     for (int i = 0; i < 5; i++) {

        System.out.println("Enter player " + (i+1) + "'s jersey number: ");

        players[i][0] = scan.nextInt();

        if( players[i][0] >= 0 && players[i][0] < 100 ) {

             System.out.println("Enter player number less than 100");

               System.out.println("Enter player " + (i+1) + "'s rating: ");

               players[i][1] = scan.nextInt();

               if ( players[i][1] >= 1 && players[i][1] <10 ) {

                     System.out.println();

               }    else {

                     System.out.println("Enter player " + (i+1) + "'s rating: ");

                     players[i][1] = scan.nextInt();

               }

     }

     }

     System.out.println();

     outputRoster(players, 0);

     

     while (keepAlive) {

        outputMenu();

        input = scan.next().charAt(0);

        if (input == 'q') {

           keepAlive = false;

           break;

        } else if (input == 'o') {

           outputRoster(players, 0);

        } else if (input == 'u') {

           System.out.println("Enter a jersey number: ");

           int jerseyNum = scan.nextInt();

           System.out.println("Enter a new rating for the player: ");

           int newRating = scan.nextInt();

           for (int l = 0; l < 5; l++) {

              if (players[l][0] == jerseyNum) {

                 players[l][1] = newRating;

              }

           }

        } else if (input == 'a') {

           System.out.println("Enter a rating: ");

           int rating = scan.nextInt();

           outputRoster(players, rating);

        } else if (input == 'r') {

           System.out.println("Enter a jersey number: ");

           int jerseyNum = scan.nextInt();

           boolean exists = true;

           for (int l = 0; l < 5; l++) {

              if (players[l][0] == jerseyNum) {

                 System.out.println("Enter a new jersey number: ");

                 players[l][0] = scan.nextInt();

                 System.out.println("Enter a rating for the new player: ");

                 players[l][1] = scan.nextInt();

              }

           }

           

        }

     }

     

     return;

  }

   

  public static void outputRoster(int[][] players, int min) {

     System.out.println(((min>0) ? ("ABOVE " + min) : ("ROSTER")));

     int item = 1;

     for (int[] player : players) {

        if (player[1] > min) {

           System.out.println("Player " + item + " -- Jersey number: " + player[0] + ", Rating: " + player[1]);

        }

        item++;

     }

     System.out.println();

  }

   

  public static void outputMenu() {

     System.out.println("MENU");

     System.out.println("u - Update player rating");

     System.out.println("a - Output players above a rating");

     System.out.println("r - Replace player");

     System.out.println("o - Output roster");

     System.out.println("q - Quit\n");

     System.out.println("Choose an option: ");  

  }

}

Explanation:

The program is written in Java.

It is a bit straightforward.

The Scanner module is declared and used to collect input from the user.

The program prompts the user for each player jersey then rating.

All five players details are collected.

The program shows the output of all the entries.

5 0
3 years ago
This exspansion slot essentially replaced PCI and AGP slots
MrRa [10]
PCI and AGP slots have been replaced with PCI-E slot (PCI-Express). There are different types of PCI-E buses:

PCI Express 1x (250 [500] * MB/s)
PCI Express 2x (500 [1000] * MB/s)
PCI Express 4x (1000 [2000] * MB/s)
PCI Express 8x (2000 [4000] * MB/s)
PCI Express 16x (4000 [8000] * MB/s)
<span>PCI Express 32x (8000 [16000] * MB/s)

I hope that's what you meant :)</span>
4 0
3 years ago
What does c++ programming mean?
cestrela7 [59]

Answer:

It's an internal joke to say the language is basically C with some extra stuff (like classes)

the "++" is short for

C += 1 or

C = C + 1 which is a common calculation among programmers so they named it C++ to be a more commercial and attractive name than "C with classes"

Explanation:

8 0
3 years ago
Why must programs written in a high-level language be translated into machine language?
eimsori [14]
The only thing that a computer actually understands is machine language. English-like constructs are gibberish to a computer, so they need to be translated by a compiler to machine language to run natively.
4 0
3 years ago
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